When calling invokeMethod, some plugins use a method name along the lines of $ClassName#MethodName. When trying to obfuscate the dart code in a flutter app, this may inadvertently change the class names on the dart side, but not the native side.

For example invokeMethod('$Adder#add') would be replaced with invokeMethod('$zza#add').

I'm not sure of all plugins that would be affected by this, but firebase_ml_vision and firebase_performance use this format.

This could be solved by just removing the $ in front of the method name.

Related comment: flutter/plugins@90ed52d#commitcomment-34121822