The Flutter extension issues are to be filed here in the Dart-code/dart-code repo's issue tracker. Which is fine, but just a little confusing. Some folks might end up on dart-code/dart-code looking to file an issue on the flutter extension and wonder if they made a wrong turn :)

Suggestion:

Create an explicit "Flutter extension" template which appears when you click "New issue". That way, it's clear that this is the right place to file an issue on the Flutter extension.

Thanks for considering!