Colon added to pubspec dependency entry in custom action prevents compilation on desktop

Hi, when I compile the project to test it locally on desktop, and the project contains a custom action with a dependency, the dependency emitted to pubspec.yaml inexplicably is concatenated with a : which breaks the compilation.

For example, when I add a mutex 3.1.0 dependency to custom action, the pubspec.yaml file created by FlutterFlow contains mutex 3.1.0: instead (line 22 in the image below).

The additional trailing : brakes the compilation process.