Flutter单文件多Widget测试不稳定问题求助

我实现了两个Widget测试，单独运行时均正常，但同时运行时第二个测试总会抛出异常；调换测试顺序后，文件中的第二个测试仍会失败。测试逻辑较为简单，我无从下手，曾尝试过类似问题的解决方案但未成功。

测试中我尝试通过hitTestable校验Widget的图标是否在屏幕上可见，代码如下：

import 'dart:math';

import 'package:circle_ui_navigator/circle_ui_navigator.dart';
import 'package:circle_ui_navigator/src/icons_circle/tappable_icon.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

import 'test_utils.dart';

const iPhone13Size = Size(375, 667);
const samsungS20LandscapeSize = Size(800, 360);

void main() {
  testWidgets("""GIVEN landscape and widget centered on a screen 
  WHEN 5 actions 
  THEN 6 icons found""", (tester) async {
    await tester.binding.setSurfaceSize(samsungS20LandscapeSize);
    await tester.loadCircleNavigatorWidget(
      actionsCount: 5,
      center: Point(
        samsungS20LandscapeSize.width / 2,
        samsungS20LandscapeSize.height / 2,
      ),
    );
    await tester.pumpAndSettle(Duration(milliseconds: animationDuration));

    expect(find.byType(TappableIcon).hitTestable(), findsNWidgets(6));
    await tester.binding.setSurfaceSize(null);
  });

  testWidgets('''GIVEN portrait and widget centered on a screen WHEN 9 actions THEN 10 icons found''', (tester) async {
    await tester.binding.setSurfaceSize(iPhone13Size);
    await tester.loadCircleNavigatorWidget(
      actionsCount: 9,
      center: Point(iPhone13Size.width / 2, iPhone13Size.height / 2),
    );
    await tester.pumpAndSettle(Duration(milliseconds: animationDuration));

    expect(find.byType(TappableIcon).hitTestable(), findsNWidgets(10));
    await tester.binding.setSurfaceSize(null);
  });
}

完整代码可查看对应仓库的测试文件。

测试框架抛出的错误如下：

══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════
The following TestFailure was thrown running a test:
Expected: exactly 10 matching nodes in the widget tree
  Actual: _HitTestableFinder:<zero widgets with type "TappableIcon" (considering only hit-testable
ones) (ignoring offstage widgets)>
   Which: means none were found but some were expected

请问有人遇到过这类问题并解决了吗？

内容的提问来源于stack exchange，提问作者PrzemekTom