diff --git a/loopx/control_plane/runtime/runtime_projection_route.py b/loopx/control_plane/runtime/runtime_projection_route.py
index 2e83d3d9d2..801bc8cd6c 100644
--- a/loopx/control_plane/runtime/runtime_projection_route.py
+++ b/loopx/control_plane/runtime/runtime_projection_route.py
@@ -58,27 +58,10 @@ def _registry_runtime_root(
     registry: dict[str, Any],
     *,
     registry_path: Path,
-    goal_id: str,
 ) -> Path:
-    runtime_root = resolve_runtime_root(registry, None).expanduser()
-    if not runtime_root.is_absolute():
-        goal = next(
-            (
-                item
-                for item in registry_goals(registry)
-                if str(item.get("id") or "") == goal_id
-            ),
-            None,
-        )
-        repo = Path(str((goal or {}).get("repo") or "")).expanduser()
-        if not repo.is_absolute():
-            repo = (
-                registry_path.parent.parent
-                if registry_path.parent.name == ".loopx"
-                else registry_path.parent
-            )
-        runtime_root = repo / runtime_root
-    return runtime_root.resolve()
+    return resolve_runtime_root(
+        registry, None, registry_path=registry_path,
+    ).expanduser().resolve()
 
 
 def _goal_source_route_packet(
@@ -131,7 +114,6 @@ def resolve_goal_source_runtime_route(
     invoked_runtime = _registry_runtime_root(
         registry_payload,
         registry_path=invoked_registry,
-        goal_id=goal_id,
     )
     if runtime_root_override:
         runtime_root = Path(runtime_root_override).expanduser().resolve()
@@ -200,7 +182,6 @@ def resolve_goal_source_runtime_route(
     source_runtime = _registry_runtime_root(
         source_payload,
         registry_path=source_registry,
-        goal_id=goal_id,
     )
     return _goal_source_route_packet(
         status="source_registry",
diff --git a/tests/control_plane/test_explore_source_runtime_route.py b/tests/control_plane/test_explore_source_runtime_route.py
index eaf5a07e32..8d28d4e5a5 100644
--- a/tests/control_plane/test_explore_source_runtime_route.py
+++ b/tests/control_plane/test_explore_source_runtime_route.py
@@ -105,6 +105,19 @@ def test_global_goal_route_uses_source_registry_relative_runtime(
     assert Path(route["source_runtime_root"]) == project / ".loopx" / "runtime"
 
 
+def test_relative_runtime_belongs_to_registry_even_when_goal_repo_differs(tmp_path: Path) -> None:
+    for relative_registry in ("registry.json", ".loopx/registry.json"):
+        owner = tmp_path / relative_registry.replace("/", "-")
+        registry = owner / relative_registry
+        _write_registry(registry, runtime_root="runtime")
+        payload = json.loads(registry.read_text())
+        payload["goals"][0]["repo"] = str(tmp_path / "separate-goal-checkout")
+        registry.write_text(json.dumps(payload))
+        route = resolve_goal_source_runtime_route(registry_path=registry, goal_id=GOAL_ID)
+        assert Path(route["source_runtime_root"]) == owner / "runtime"
+        assert route["status"] == "project_registry"
+
+
 def test_feishu_sync_uses_source_rows_and_visual_marker(tmp_path: Path) -> None:
     project = tmp_path / "project"
     source_registry = project / ".loopx" / "registry.json"