fast/images/async-image-background-change.html is a flakey timeout in macOS BigSur wk2 in release and debug for Apple Silicon only. HISTORY URL: https://results.webkit.org/?suite=layout-tests&test=fast%2Fimages%2Fasync-image-background-change.html&platform=mac As it turns out, the link for the timeout diff results in a 404 error. When looking at the history, it appears that the test is very flakey, and has only timed out on Apple Silicon only 3 or 4 times.
<rdar://problem/75585580>
Updated test expectations to Pass Timeout here: https://trac.webkit.org/changeset/274665/webkit
Created attachment 425481 [details] Patch
Committed r275771 (236346@main): <https://commits.webkit.org/236346@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 425481 [details].