Karma 5.X sometimes reports "Some of your tests did a full page reload!"

[peitschie]

Describe the Bug

I have some project setups that are failing with this extension, reporting "Some of your tests did a full page reload!".
If I modify a file and save it, the subsequent run correctly discovers the tests. It's only ever the initial project open that fails.

Steps to Reproduce the Behavior

Steps to reproduce are unclear. I have similar repos that do not have this issue, and only one that is exhibiting this symptom.
Unfortunately, I cannot share the repo with this symptom for commercial reasons.

Describe the Expected Behavior

The tests should be properly discovered.

Debug Logs

Karma Test Explorer logs snippet:

[2021-10-30 00:51:11.618] [TRACE] [MultiEventHandler]: Using assigned handler for received event: run_complete
[2021-10-30 00:51:11.618] [DEBUG] [KarmaTestEventListener]: Test run completed with status 'Complete' for browsers: Chrome Headless 95.0.4638.54 (Windows 10)
[2021-10-30 00:51:11.618] [DEBUG] [KarmaTestEventListener]: Received 'run_complete' event with run Id 'lcdsed19y1d' while no requested user test capture
[2021-10-30 00:51:11.619] [DEBUG] [KarmaHttpTestRunExecutor]: Karma http request closed
[2021-10-30 00:52:02.513] [DEBUG] [Notifications]: User selected 'Show Log' for 'Error' notification: Failed to load tests - Test discovery failed: Browser Error - Some of your tests did a full page reload! (Click to show log)

Karma Server:

30 10 2021 11:51:10.855:DEBUG [reporter:KarmaTestExplorerReporter]: New Karma event: browser_error

Chrome Headless 95.0.4638.54 (Windows 10) ERROR
  Some of your tests did a full page reload!

Screenshots

Please Provide the Following Information

• OS: Windows 10
• Environment: Karma 5.2.3
• Version: v0.2.1

Additional Context

This is possibly related to karma-runner/karma#3482. Upgrading temporarily to karma 6 appeared to fix the issue, but for various reasons I can't use this an actual fix.

[lucono]

This is fixed in v0.3.0.