Предположительно неправильно работает screenToWorld

Пытаюсь реализовать рисование области пальцем. Либо некорректно работает преобазование в методе screenToWorld, либо я что-то делаю не так.
zoom установленный по умолчанию.

import 'package:flutter/material.dart';
import 'package:yandex_maps_mapkit/mapkit.dart';
import 'package:yandex_maps_mapkit/yandex_map.dart';

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

  @override
  State<MainPage> createState() => _MainPageState();
}

class _MainPageState extends State<MainPage> {
  MapWindow? _mapWindow;
  final List<Point> _polygonPoints = [];
  bool _isDrawing = false;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: GestureDetector(
        onLongPressStart: _handleLongPressStart,
        onLongPressMoveUpdate: _handleLongPressMoveUpdate,
        onLongPressEnd: _handleLongPressEnd,
        child: YandexMap(
          onMapCreated: _onMapCreated,
        ),
      ),
    );
  }

  void _onMapCreated(MapWindow mapWindow) {
    _mapWindow = mapWindow;
  }

  void _handleLongPressStart(LongPressStartDetails details) {
    final RenderBox renderBox = context.findRenderObject() as RenderBox;
    print(renderBox.localToGlobal(details.globalPosition)); 
    final Point? point = _screenPointToMapPoint(renderBox.globalToLocal(details.globalPosition));
    setState(() {
      _polygonPoints.clear();
      _polygonPoints.add(point!);
      _isDrawing = true;
    });
  }

  void _handleLongPressMoveUpdate(LongPressMoveUpdateDetails details) {
    final RenderBox renderBox = context.findRenderObject() as RenderBox;
    final Point? point = _screenPointToMapPoint(renderBox.globalToLocal(details.localPosition));
    if (_isDrawing) {
      setState(() {
        _polygonPoints.add(point!);
      });
    }
  }

  Point? _screenPointToMapPoint(Offset localPosition) {
    final point = ScreenPoint(x: localPosition.dx, y: localPosition.dy);
    print(point);
    print(_mapWindow!.screenToWorld(point));
    return _mapWindow!.screenToWorld(point);
  }

  void _handleLongPressEnd(LongPressEndDetails details) {
    if (_isDrawing) {
      setState(() {
        _isDrawing = false;
        if (_polygonPoints.length > 3) {
          _drawPolygon();
        }
      });
    }
  }

  void _drawPolygon() {
    if (_mapWindow != null && _polygonPoints.isNotEmpty) {
      final polygon = Polygon(
        LinearRing(_polygonPoints), []
      );
      _mapWindow!.map.mapObjects.addPolygon(polygon);
    }
  }
}

I/flutter ( 7543): Offset(152.0, 362.1)
I/flutter ( 7543): ScreenPoint(x: 151.9950284090909, y: 362.14950284090907)
I/flutter ( 7543): Point(latitude: 78.99708352591344, longitude: 40.39708695628468)

в итоге область появляется ближе к верхнему левому углу при рисовании ближе к центру.

Start with _handleLongPressStart, _handleLongPressMoveUpdate, and _screenPointToMapPoint, then inspect how the GestureDetector positions relate to MapWindow.screenToWorld input. Reproduce the reported offset and compare the coordinates used for the start and move events. Done means the drawn polygon follows the user's finger instead of appearing toward the upper-left.