Crash data show that there's a crash under RenderLayer::calculateClipRects() involving fullscreen.
<rdar://121960496>
Pull request: https://github.com/WebKit/WebKit/pull/23981
Committed 274290@main (1021d66fe7c3): <https://commits.webkit.org/274290@main> Reviewed commits have been landed. Closing PR #23981 and removing active labels.