diff --git a/packages/rn-tester/js/examples/Playground/RNTesterPlayground.js b/packages/rn-tester/js/examples/Playground/RNTesterPlayground.js
index 8e6b10479de7..bec1a1fb2302 100644
--- a/packages/rn-tester/js/examples/Playground/RNTesterPlayground.js
+++ b/packages/rn-tester/js/examples/Playground/RNTesterPlayground.js
@@ -14,12 +14,25 @@ import RNTesterText from '../../components/RNTesterText';
 import * as React from 'react';
 import {StyleSheet, View} from 'react-native';
 
+// Repro for #57190: on Android + New Architecture, setting `outlineColor`
+// crashes with:
+//   java.lang.ClassCastException: java.lang.Double cannot be cast to
+//   java.lang.Integer
+//     at com.facebook.react.uimanager.BaseViewManagerDelegate.setProperty
+//
+// Root cause: `BaseViewManagerDelegate` casts the outline color prop straight
+// to Int (`value as Int?`) while every other color prop (backgroundColor,
+// shadowColor) uses `ColorPropConverter.getColor(...)`. Under Fabric, color
+// props are always delivered as `Double`, so the cast throws on mount.
+//
+// Rendering the View below is enough to crash the app on Android.
 function Playground() {
   return (
     <View style={styles.container}>
       <RNTesterText>
-        Edit "RNTesterPlayground.js" to change this file
+        #57190: the outlined box below crashes on Android (New Architecture)
       </RNTesterText>
+      <View style={styles.outlined} />
     </View>
   );
 }
@@ -27,6 +40,14 @@ function Playground() {
 const styles = StyleSheet.create({
   container: {
     padding: 10,
+    gap: 10,
+  },
+  outlined: {
+    width: 100,
+    height: 100,
+    outlineColor: '#007AFF',
+    outlineWidth: 2,
+    outlineStyle: 'solid',
   },
 });