(+++solved+++) Custom Action can't be saved >" Failed to process parameters"

// Automatic FlutterFlow imports import '/backend/backend.dart'; import '/flutter_flow/flutter_flow_theme.dart'; import '/flutter_flow/flutter_flow_util.dart'; import '/flutter_flow/custom_functions.dart'; import 'package:flutter/material.dart'; // Begin custom action code // DO NOT REMOVE OR MODIFY THE CODE ABOVE! import 'package:cloud_firestore/cloud_firestore.dart'; Future<bool> checkAndDeductCredits({ required DocumentReference userRef, required String featureType, required bool isValidInput, }) async { return true; // Simple placeholder }

Everything. Also, I am on a paid plan, which means I have access to VS Studio. So, I saved a very barebones boilerplate code to create the file, without arguments, but with the Return Value set to a boolean. The idea was to pull the code in VS Studio, populate it, and push it back. This sometimes works and circumvents FF's underlying issues we get all of the time, btw.
Unfortunately, this time, the code couldn't even be pushed up.

And this is the bare bone code I could save, arguments in code and in custom action panel both missing:

// Automatic FlutterFlow imports
import '/backend/backend.dart';
import '/backend/schema/structs/index.dart';
import '/flutter_flow/flutter_flow_theme.dart';
import '/flutter_flow/flutter_flow_util.dart';
import '/custom_code/actions/index.dart'; // Imports other custom actions
import '/flutter_flow/custom_functions.dart'; // Imports custom functions
import 'package:flutter/material.dart';
// Begin custom action code
// DO NOT REMOVE OR MODIFY THE CODE ABOVE!

import '/flutter_flow/custom_functions.dart';

import 'package:cloud_firestore/cloud_firestore.dart'; // Keep this import as it will be needed later

Future<bool> checkAndDeductCredits() async {
  // This is the absolute barebones placeholder with a Future<bool> return.
  // It has no parameters defined in the function signature here.
  // The goal is solely to get FlutterFlow to save the custom action itself.
  return true;
}

(+++solved+++) Custom Action can't be saved >" Failed to process parameters" - Yet again!