Describe the bug
When working with the SDK and test_reflective_loader tests, adding a new test after running the suite makes some tests get out of sync with the gutter.

To Reproduce
Steps to reproduce the behavior:

1. Open pkg/linter/test/rules/prefer_initializing_formals_test.dart (or whatever test file with it)
2. Run the tests
3. Add test_a() {} above all other tests
4. Run again, see the test below it get out of sync with the test gutter

Expected behavior
For the tests to have different gutter icons.

Screenshots

Please complete the following information:

Dart Code extension: 3.117.20250813
Flutter extension: 3.117.20250731 (activated)
App: Visual Studio Code
App Host: desktop
Version: win 1.103.2
Workspace type: Dart (LSP) (Multiroot)
Workspace name: sdk (Workspace)
Dart (3.10.0-edge.1a2411efc9a5988d76b967202a99bb9e38f2cbfc): C:\Users\felip_0vh5fa6\dart
Flutter (3.32.8): C:\Users\felip_0vh5fa6\.puro\envs\stable\flutter (No device)

C:\Users\felip_0vh5fa6\dart\bin\dart.exe info

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General info

• Dart 3.10.0-edge.1a2411efc9a5988d76b967202a99bb9e38f2cbfc (main) (Fri Aug 22 04:22:13 2025 -0700) on "windows_x64"
• on windows / "Windows 11 Pro" 10.0 (Build 26100)
• locale is pt-BR

Process info