Steps to reproduce

Using Flutter 3.27.1, Xcode 16.2, iOS Simulator 18.2:

1. Create a SwiftPM plugin:

   flutter config --enable-swift-package-manager
   flutter create --template=plugin --platforms=ios plugin_a
   

2. Create a SwiftPM app:

   flutter config --enable-swift-package-manager
   flutter create my_app
   cd my_app
   flutter build ios --config-only
   

3. Open project in Xcode

   1. Open the app's ios/Runner.xcworkspace using Xcode

4. Modify my_app/pubspec.yaml to depend on the plugin:

     dependencies:
   +   plugin_a:
   +     path: ../plugin_a

5. Start iOS simulator 18.2

6. Run the app:

flutter run

Expected results

I expect plugin_a to be found. I suspect this is a caching issue that's cause by having the project open in Xcode while also running from the command line, but we should look into it more.

Actual results

           ComputeTargetDependencyGraph
           note: Building targets in dependency order
           note: Target dependency graph (3 targets)
               Target 'Runner' in project 'Runner'
                   ➜ Explicit dependency on target 'FlutterGeneratedPluginSwiftPackage' in project 'FlutterGeneratedPluginSwiftPackage'
               Target 'FlutterGeneratedPluginSwiftPackage' in project 'FlutterGeneratedPluginSwiftPackage'
                   ➜ Explicit dependency on target 'FlutterGeneratedPluginSwiftPackage' in project 'FlutterGeneratedPluginSwiftPackage'
               Target 'FlutterGeneratedPluginSwiftPackage' in project 'FlutterGeneratedPluginSwiftPackage' (no dependencies)

...

GeneratedPluginRegistrant.m:12:9: error: Module 'plugin_a' not found (in target 'Runner' from project 'Runner')

Code sample

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