diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e66f22024e0..da78f6acd54 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -56,8 +56,8 @@ jobs:
           - os: macos-15
             config: "swift-ios"
             working_directory: "swift"
-            build_flags: "PLATFORMS='macosx iphonesimulator'"
-            test_flags: "--platform=iphonesimulator --controller-app --rfilter=Ice/operations" # Remove rfilter once #3286 is fixed
+            build_flags: "PLATFORMS='macosx iphonesimulator' OPTIMIZE=no"
+            test_flags: "--config Debug --platform=iphonesimulator --controller-app --filter=Ice/operations" # Remove rfilter once #3286 is fixed
             build_cpp_and_python: true
 
           # Static builds
diff --git a/swift/src/IceImpl/DispatchAdapter.mm b/swift/src/IceImpl/DispatchAdapter.mm
index ffc82f6ea88..cd2efffd398 100644
--- a/swift/src/IceImpl/DispatchAdapter.mm
+++ b/swift/src/IceImpl/DispatchAdapter.mm
@@ -28,7 +28,7 @@
         auto encapsulation = new std::vector<std::byte>(inEncaps, inEncaps + sz);
         inEncaps = encapsulation->data();
 
-        cleanup = [encapsulation] { delete encapsulation; };
+        cleanup = [encapsulation] { };
     }
     else
     {
@@ -37,7 +37,7 @@
         // When dispatch completes, the new InputStream will be deleted.
         auto dispatchInputStream = new Ice::InputStream(std::move(request.inputStream()));
 
-        cleanup = [dispatchInputStream] { delete dispatchInputStream; };
+        cleanup = [dispatchInputStream, inEncaps] {};
 
         dispatchInputStream->readEncapsulation(inEncaps, sz);
     };