I just spent a long while tracking down an error that ended up being related to an Integer type field in FlutterFlow where a document in FireStore contained a double.
The result of the error was a spinner when the query executed. It was defined on a widget and was of the type Get Document From Reference.
I downloaded the code and ran in debug mode using Android Studio and it did not log or throw any errors.
It would be helpful if there was some sort of type check logging in FlutterFlow. Or maybe there is and I missed it.