https://github.com/flutter/flutter/issues/92606

main.dart

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();

  // Auto-enable accessibility for our Blind and Low Vision customers
  RendererBinding.instance?.setSemanticsEnabled(true);
  
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: MyStatefulWidget(),
    );
  }
}

class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  @override
  Widget build(BuildContext context) {
    return const Scaffold(
      body: PinPut(),
    );
  }
}

class PinPut extends StatefulWidget {
  const PinPut({Key? key}) : super(key: key);

  @override
  _PinPutState createState() => _PinPutState();
}

class _PinPutState extends State<PinPut> {
  @override
  Widget build(BuildContext context) {
    return Stack(
      children: <Widget>[
        TextFormField(
          // This seems to be the problem: when false, the input gets reversed
          enableInteractiveSelection: false,
        ),
      ],
    );
  }
}