Prevent same bottom sheet to appear twice or more

I tried to implement this custom action generated by Claude and placed it at the very first of the action chain, but without success.

// Automatic FlutterFlow imports
import '/backend/backend.dart';
import '/backend/schema/structs/index.dart';
import '/backend/supabase/supabase.dart';
import '/actions/actions.dart' as action_blocks;
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 '/custom_code/actions/index.dart';
import '/flutter_flow/custom_functions.dart';

class BottomSheetSpamBlocker {
  static bool _isOpening = false;

  static bool get isOpening => _isOpening;
  static set isOpening(bool value) => _isOpening = value;
}

Future preventSpamBottomSheet() async {
  if (BottomSheetSpamBlocker.isOpening) {
    return;
  }

  BottomSheetSpamBlocker.isOpening = true;

  await Future.delayed(const Duration(milliseconds: 500), () {
    BottomSheetSpamBlocker.isOpening = false;
  });
}