They've been triggering for a couple of months now (since September 2022?), every time fullscreen is exited on debug builds. It's pretty bogus for debugging exit fullscreen-related tasks. For release, there's an early return that handles this case.
<rdar://problem/104564945>
Pull request: https://github.com/WebKit/WebKit/pull/8982
*** This bug has been marked as a duplicate of bug 248093 ***