fast/images/mac/play-all-pause-all-animations-context-menu-items.html has been a consistent failure/timeout on macOS WK1 since it was added with https://commits.webkit.org/256360@main

--- /Volumes/Data/worker/macOS-BigSur-Release-WK1-Tests-EWS/build/layout-test-results/fast/images/mac/play-all-pause-all-animations-context-menu-items-expected.txt
+++ /Volumes/Data/worker/macOS-BigSur-Release-WK1-Tests-EWS/build/layout-test-results/fast/images/mac/play-all-pause-all-animations-context-menu-items-actual.txt
@@ -5,10 +5,9 @@
 
 PASS internals.isImageAnimating(img) became true
 Pausing all animations via the context menu item.
-PASS internals.isImageAnimating(img) became false
-Playing all animations via the context menu item.
-PASS internals.isImageAnimating(img) became true
-PASS successfullyParsed is true
+FAIL Unexpected error: TypeError: undefined is not an object (evaluating 'eventSender.contextClick().find(item => item.title === "Pause All Animations").click')
+FAIL successfullyParsed should be true. Was false.
+Some tests failed.
 
 TEST COMPLETE
 

https://results.webkit.org/?suite=layout-tests&test=fast%2Fimages%2Fmac%2Fplay-all-pause-all-animations-context-menu-items.html