diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractPythonConnexionServerCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractPythonConnexionServerCodegen.java
index f7b7202d543a..a286e60e01a0 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractPythonConnexionServerCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractPythonConnexionServerCodegen.java
@@ -724,6 +724,11 @@ public OperationsMap postProcessOperationsWithModels(OperationsMap objs, List<Mo
                     }
                 }
             }
+            for (CodegenParameter param : operation.allParams) {
+                if ((param.isFreeFormObject || param.isAnyType) && "object".equals(param.dataType)) {
+                    param.vendorExtensions.put("x-python-connexion-skip-from-dict", Boolean.TRUE);
+                }
+            }
         }
         return objs;
     }
diff --git a/modules/openapi-generator/src/main/resources/python-aiohttp/controller.mustache b/modules/openapi-generator/src/main/resources/python-aiohttp/controller.mustache
index 170f65ed4b19..589104d5cb7d 100644
--- a/modules/openapi-generator/src/main/resources/python-aiohttp/controller.mustache
+++ b/modules/openapi-generator/src/main/resources/python-aiohttp/controller.mustache
@@ -67,7 +67,9 @@ async def {{operationId}}(request: web.Request, {{#allParams}}{{paramName}}{{^re
             {{^isPrimitiveType}}
                 {{^isFile}}
                     {{^isUuid}}
+                        {{^vendorExtensions.x-python-connexion-skip-from-dict}}
     {{paramName}} = {{baseType}}.from_dict({{paramName}})
+                        {{/vendorExtensions.x-python-connexion-skip-from-dict}}
                     {{/isUuid}}
                 {{/isFile}}
             {{/isPrimitiveType}}
@@ -88,13 +90,16 @@ async def {{operationId}}(request: web.Request, {{#allParams}}{{paramName}}{{^re
         {{#isMap}}
             {{#items}}
                 {{#isDate}}
-    {{paramName}} = {k: util.deserialize_date(v) for k, v in {{paramName}}}
+    if {{paramName}} is not None:
+        {{paramName}} = {k: util.deserialize_date(v) for k, v in {{paramName}}.items()}
                 {{/isDate}}
                 {{#isDateTime}}
-    {{paramName}} = {k: util.deserialize_datetime(v) for k, v in {{paramName}}}
+    if {{paramName}} is not None:
+        {{paramName}} = {k: util.deserialize_datetime(v) for k, v in {{paramName}}.items()}
                 {{/isDateTime}}
                 {{#complexType}}
-    {{paramName}} = {k: {{baseType}}.from_dict(v) for k, v in {{paramName}}}
+    if {{paramName}} is not None:
+        {{paramName}} = {k: {{baseType}}.from_dict(v) for k, v in {{paramName}}.items()}
                 {{/complexType}}
             {{/items}}
         {{/isMap}}
diff --git a/modules/openapi-generator/src/main/resources/python-blueplanet/app/{{packageName}}/controllers/controller.mustache b/modules/openapi-generator/src/main/resources/python-blueplanet/app/{{packageName}}/controllers/controller.mustache
index afba1f7cfefb..8dfbb20311d3 100644
--- a/modules/openapi-generator/src/main/resources/python-blueplanet/app/{{packageName}}/controllers/controller.mustache
+++ b/modules/openapi-generator/src/main/resources/python-blueplanet/app/{{packageName}}/controllers/controller.mustache
@@ -67,8 +67,10 @@ def {{operationId}}({{#allParams}}{{paramName}}{{^required}}=None{{/required}}{{
             {{^isPrimitiveType}}
                 {{^isFile}}
                     {{^isUuid}}
+                        {{^vendorExtensions.x-python-connexion-skip-from-dict}}
     if connexion.request.is_json:
         {{paramName}} = {{baseType}}.from_dict(connexion.request.get_json())  # noqa: E501
+                        {{/vendorExtensions.x-python-connexion-skip-from-dict}}
                     {{/isUuid}}
                 {{/isFile}}
             {{/isPrimitiveType}}
diff --git a/modules/openapi-generator/src/main/resources/python-flask/controller.mustache b/modules/openapi-generator/src/main/resources/python-flask/controller.mustache
index d5118c610a74..e40b8e679b3b 100644
--- a/modules/openapi-generator/src/main/resources/python-flask/controller.mustache
+++ b/modules/openapi-generator/src/main/resources/python-flask/controller.mustache
@@ -73,8 +73,10 @@ def {{operationId}}({{#allParams}}{{^isBodyParam}}{{paramName}}{{/isBodyParam}}{
             {{^isPrimitiveType}}
                 {{^isFile}}
                     {{^isUuid}}
+                        {{^vendorExtensions.x-python-connexion-skip-from-dict}}
     if flask.request.is_json:
         {{paramName}} = {{baseType}}{{^baseType}}{{#dataType}} {{.}}{{/dataType}}{{/baseType}}.from_dict(flask.request.get_json())  # noqa: E501
+                        {{/vendorExtensions.x-python-connexion-skip-from-dict}}
                     {{/isUuid}}
                 {{/isFile}}
             {{/isPrimitiveType}}
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/python/AbstractPythonConnexionServerCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/python/AbstractPythonConnexionServerCodegenTest.java
index c4133bf1ccd5..9d5042c237cd 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/python/AbstractPythonConnexionServerCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/python/AbstractPythonConnexionServerCodegenTest.java
@@ -1,18 +1,36 @@
 package org.openapitools.codegen.python;
 
 import com.google.common.collect.ImmutableMap;
+import io.swagger.parser.OpenAPIParser;
+import io.swagger.v3.oas.models.OpenAPI;
+import io.swagger.v3.oas.models.parameters.Parameter;
+import io.swagger.v3.parser.core.models.ParseOptions;
+import org.apache.commons.io.FileUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.openapitools.codegen.CodegenConstants;
+import org.openapitools.codegen.CodegenParameter;
+import org.openapitools.codegen.DefaultGenerator;
+import org.openapitools.codegen.config.CodegenConfigurator;
 import org.openapitools.codegen.languages.AbstractPythonConnexionServerCodegen;
+import org.openapitools.codegen.languages.PythonAiohttpConnexionServerCodegen;
 import org.testng.annotations.DataProvider;
 import org.testng.annotations.Test;
 
 import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.openapitools.codegen.TestUtils.assertFileContains;
+import static org.openapitools.codegen.TestUtils.assertFileExists;
+import static org.openapitools.codegen.TestUtils.assertFileNotContains;
 import static org.openapitools.codegen.languages.AbstractPythonConnexionServerCodegen.*;
 
 public class AbstractPythonConnexionServerCodegenTest {
@@ -142,4 +160,176 @@ private static String platformAgnosticPath(String... nodes) {
         return StringUtils.join(nodes, File.separatorChar);
     }
 
+    @Test(description = "python-aiohttp map parameters should iterate .items()")
+    public void testAiohttpMapParametersIterateItems() throws IOException {
+        String specPath = "src/test/resources/3_1/python/map-and-freeform-params.yaml";
+
+        File aiohttpOutput = Files.createTempDirectory("test-aiohttp-map-params").toFile().getCanonicalFile();
+        try {
+            CodegenConfigurator aiohttpConfig = new CodegenConfigurator()
+                    .setGeneratorName("python-aiohttp")
+                    .setInputSpec(specPath)
+                    .setOutputDir(aiohttpOutput.getAbsolutePath());
+            new DefaultGenerator().opts(aiohttpConfig.toClientOptInput()).generate();
+
+            Path aiohttpController = Paths.get(
+                    aiohttpOutput.getAbsolutePath(),
+                    "openapi_server",
+                    "controllers",
+                    "default_controller.py");
+            assertFileExists(aiohttpController);
+            assertFileContains(
+                    aiohttpController,
+                    "    if date_map is not None:\n        date_map = {k: util.deserialize_date(v) for k, v in date_map.items()}",
+                    "    if datetime_map is not None:\n        datetime_map = {k: util.deserialize_datetime(v) for k, v in datetime_map.items()}",
+                    "    if model_map is not None:\n        model_map = {k: Tag.from_dict(v) for k, v in model_map.items()}");
+            assertFileNotContains(
+                    aiohttpController,
+                    "for k, v in date_map}",
+                    "for k, v in datetime_map}",
+                    "for k, v in model_map}");
+        } finally {
+            FileUtils.deleteDirectory(aiohttpOutput);
+        }
+    }
+
+    @Test(description = "Connexion servers should skip from_dict only on untyped/free-form object parameters and keep from_dict on composed/model parameters")
+    public void testFreeFormAndAnyTypeParametersDoNotCallFromDict() throws IOException {
+        String specPath = "src/test/resources/3_1/python/map-and-freeform-params.yaml";
+        String composedSpecPath = "src/test/resources/3_1/python/composed-query-params.yaml";
+
+        OpenAPI openAPI = new OpenAPIParser().readLocation(specPath, null, new ParseOptions()).getOpenAPI();
+        PythonAiohttpConnexionServerCodegen codegen = new PythonAiohttpConnexionServerCodegen();
+        codegen.setOpenAPI(openAPI);
+        List<Parameter> testParameters = openAPI.getPaths().get("/test").getGet().getParameters();
+        CodegenParameter freeFormParam = codegen.fromParameter(testParameters.get(3), new HashSet<>());
+        CodegenParameter anyValParam = codegen.fromParameter(testParameters.get(4), new HashSet<>());
+
+        assertThat(freeFormParam.paramName).isEqualTo("free_form");
+        assertThat(freeFormParam.isFreeFormObject).isTrue();
+        assertThat(freeFormParam.isAnyType).isFalse();
+        assertThat(freeFormParam.isContainer).isFalse();
+        assertThat(freeFormParam.isPrimitiveType).isFalse();
+        assertThat(freeFormParam.dataType).isEqualTo("object");
+
+        assertThat(anyValParam.paramName).isEqualTo("any_val");
+        assertThat(anyValParam.isFreeFormObject).isFalse();
+        assertThat(anyValParam.isAnyType).isTrue();
+        assertThat(anyValParam.isContainer).isFalse();
+        assertThat(anyValParam.isPrimitiveType).isFalse();
+        assertThat(anyValParam.dataType).isEqualTo("object");
+
+        OpenAPI composedOpenAPI = new OpenAPIParser().readLocation(composedSpecPath, null, new ParseOptions()).getOpenAPI();
+        PythonAiohttpConnexionServerCodegen composedCodegen = new PythonAiohttpConnexionServerCodegen();
+        composedCodegen.setOpenAPI(composedOpenAPI);
+        List<Parameter> probeParameters = composedOpenAPI.getPaths().get("/t").getGet().getParameters();
+        CodegenParameter composedParam = composedCodegen.fromParameter(probeParameters.get(0), new HashSet<>());
+        CodegenParameter oneOfParam = composedCodegen.fromParameter(probeParameters.get(1), new HashSet<>());
+        CodegenParameter addlParam = composedCodegen.fromParameter(probeParameters.get(2), new HashSet<>());
+        assertThat(composedParam.isAnyType).isTrue();
+        assertThat(composedParam.dataType).isEqualTo("Composed");
+        assertThat(oneOfParam.isAnyType).isTrue();
+        assertThat(oneOfParam.dataType).isEqualTo("OneOfM");
+        assertThat(addlParam.paramName).isEqualTo("addl");
+        assertThat(addlParam.isMap).isTrue();
+        assertThat(addlParam.isContainer).isTrue();
+        assertThat(addlParam.isFreeFormObject).isFalse();
+        assertThat(addlParam.isAnyType).isFalse();
+        assertThat(addlParam.dataType).isEqualTo("WithAddl");
+
+        File aiohttpOutput = Files.createTempDirectory("test-aiohttp-freeform-params").toFile().getCanonicalFile();
+        try {
+            CodegenConfigurator aiohttpConfig = new CodegenConfigurator()
+                    .setGeneratorName("python-aiohttp")
+                    .setInputSpec(specPath)
+                    .setOutputDir(aiohttpOutput.getAbsolutePath());
+            new DefaultGenerator().opts(aiohttpConfig.toClientOptInput()).generate();
+
+            Path aiohttpController = Paths.get(
+                    aiohttpOutput.getAbsolutePath(),
+                    "openapi_server",
+                    "controllers",
+                    "default_controller.py");
+            assertFileExists(aiohttpController);
+            assertFileNotContains(
+                    aiohttpController,
+                    "free_form = ",
+                    "any_val = ");
+        } finally {
+            FileUtils.deleteDirectory(aiohttpOutput);
+        }
+
+        File blueplanetOutput = Files.createTempDirectory("test-blueplanet-freeform-params").toFile().getCanonicalFile();
+        try {
+            CodegenConfigurator blueplanetConfig = new CodegenConfigurator()
+                    .setGeneratorName("python-blueplanet")
+                    .setInputSpec(specPath)
+                    .setOutputDir(blueplanetOutput.getAbsolutePath());
+            new DefaultGenerator().opts(blueplanetConfig.toClientOptInput()).generate();
+
+            Path blueplanetController = Paths.get(
+                    blueplanetOutput.getAbsolutePath(),
+                    "app",
+                    "openapi_server",
+                    "controllers",
+                    "default_controller.py");
+            assertFileExists(blueplanetController);
+            assertFileNotContains(
+                    blueplanetController,
+                    "free_form = ",
+                    "any_val = ");
+        } finally {
+            FileUtils.deleteDirectory(blueplanetOutput);
+        }
+
+        File flaskOutput = Files.createTempDirectory("test-flask-freeform-params").toFile().getCanonicalFile();
+        try {
+            CodegenConfigurator flaskConfig = new CodegenConfigurator()
+                    .setGeneratorName("python-flask")
+                    .setInputSpec(specPath)
+                    .setOutputDir(flaskOutput.getAbsolutePath());
+            new DefaultGenerator().opts(flaskConfig.toClientOptInput()).generate();
+
+            Path flaskController = Paths.get(
+                    flaskOutput.getAbsolutePath(),
+                    "openapi_server",
+                    "controllers",
+                    "default_controller.py");
+            assertFileExists(flaskController);
+            assertFileNotContains(
+                    flaskController,
+                    "free_form =",
+                    "any_val =");
+        } finally {
+            FileUtils.deleteDirectory(flaskOutput);
+        }
+
+        File flaskComposedOutput = Files.createTempDirectory("test-flask-composed-params").toFile().getCanonicalFile();
+        try {
+            CodegenConfigurator flaskComposedConfig = new CodegenConfigurator()
+                    .setGeneratorName("python-flask")
+                    .setInputSpec(composedSpecPath)
+                    .setOutputDir(flaskComposedOutput.getAbsolutePath());
+            new DefaultGenerator().opts(flaskComposedConfig.toClientOptInput()).generate();
+
+            Path flaskComposedController = Paths.get(
+                    flaskComposedOutput.getAbsolutePath(),
+                    "openapi_server",
+                    "controllers",
+                    "default_controller.py");
+            assertFileExists(flaskComposedController);
+            assertFileContains(
+                    flaskComposedController,
+                    ":type addl: Dict[str, str]",
+                    "composed =  Composed.from_dict(flask.request.get_json())  # noqa: E501",
+                    "oneof =  OneOfM.from_dict(flask.request.get_json())  # noqa: E501",
+                    "plain =  Pet.from_dict(flask.request.get_json())  # noqa: E501");
+            assertFileNotContains(
+                    flaskComposedController,
+                    "addl =");
+        } finally {
+            FileUtils.deleteDirectory(flaskComposedOutput);
+        }
+    }
+
 }
diff --git a/modules/openapi-generator/src/test/resources/3_1/python/composed-query-params.yaml b/modules/openapi-generator/src/test/resources/3_1/python/composed-query-params.yaml
new file mode 100644
index 000000000000..568115a63362
--- /dev/null
+++ b/modules/openapi-generator/src/test/resources/3_1/python/composed-query-params.yaml
@@ -0,0 +1,70 @@
+openapi: 3.1.0
+
+info:
+  title: Composed and model query parameter test
+  version: 1.0.0
+
+paths:
+  /t:
+    get:
+      operationId: probe
+      parameters:
+        - name: composed
+          in: query
+          required: true
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Composed'
+        - name: oneof
+          in: query
+          required: true
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/OneOfM'
+        - name: addl
+          in: query
+          required: true
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/WithAddl'
+        - name: plain
+          in: query
+          required: true
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Pet'
+      responses:
+        '200':
+          description: OK
+
+components:
+  schemas:
+    Pet:
+      type: object
+      properties:
+        name:
+          type: string
+    Tag:
+      type: object
+      properties:
+        label:
+          type: string
+    Composed:
+      allOf:
+        - $ref: '#/components/schemas/Pet'
+        - $ref: '#/components/schemas/Tag'
+    OneOfM:
+      oneOf:
+        - $ref: '#/components/schemas/Pet'
+        - $ref: '#/components/schemas/Tag'
+    WithAddl:
+      type: object
+      properties:
+        a:
+          type: string
+      additionalProperties:
+        type: string
diff --git a/modules/openapi-generator/src/test/resources/3_1/python/map-and-freeform-params.yaml b/modules/openapi-generator/src/test/resources/3_1/python/map-and-freeform-params.yaml
new file mode 100644
index 000000000000..248151bf6638
--- /dev/null
+++ b/modules/openapi-generator/src/test/resources/3_1/python/map-and-freeform-params.yaml
@@ -0,0 +1,51 @@
+openapi: 3.1.0
+
+info:
+  title: Map and free-form parameter test
+  version: 1.0.0
+
+paths:
+  /test:
+    get:
+      operationId: testParams
+      parameters:
+        - name: date_map
+          in: query
+          schema:
+            type: object
+            additionalProperties:
+              type: string
+              format: date
+        - name: datetime_map
+          in: query
+          schema:
+            type: object
+            additionalProperties:
+              type: string
+              format: date-time
+        - name: model_map
+          in: query
+          schema:
+            type: object
+            additionalProperties:
+              $ref: '#/components/schemas/Tag'
+        - name: free_form
+          in: query
+          schema:
+            type: object
+        - name: any_val
+          in: query
+          schema: {}
+      responses:
+        '200':
+          description: OK
+
+components:
+  schemas:
+    Tag:
+      type: object
+      properties:
+        id:
+          type: integer
+        name:
+          type: string