Regression(r284654): [ iOS 15 ] Scrolling tests are image failing

• Component: Scrolling
• Status: RESOLVED CONFIGURATION CHANGED

fast/scrolling/ios/fixed-inside-overflow-inside-iframe.html
scrollingcoordinator/ios/absolute-layer-should-not-move-with-scroll.html
scrollingcoordinator/ios/fixed-in-stacking-context-overflow-scroll.html
scrollingcoordinator/ios/fixed-inside-overflow-inside-fixed.html
scrollingcoordinator/ios/fixed-inside-sticky-no-stacking-context-2.html
scrollingcoordinator/ios/fixed-inside-sticky-no-stacking-context.html
scrollingcoordinator/ios/fixed-inside-sticky-stacking-context.html
scrollingcoordinator/ios/sticky-overflow-no-stacking-context-stick-1.html
scrollingcoordinator/ios/sticky-overflow-no-stacking-context-stick-2.html
scrollingcoordinator/ios/sticky-overflow-stacking-context-stick.html

Are constantly image failing on iOS 15.

History: https://results.webkit.org/?suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&test=fast%2Fscrolling%2Fios%2Ffixed-inside-overflow-inside-iframe.html&test=scrollingcoordinator%2Fios%2Fabsolute-layer-should-not-move-with-scroll.html&test=scrollingcoordinator%2Fios%2Ffixed-in-stacking-context-overflow-scroll.html&test=scrollingcoordinator%2Fios%2Ffixed-inside-overflow-inside-fixed.html&test=scrollingcoordinator%2Fios%2Ffixed-inside-sticky-no-stacking-context-2.html&test=scrollingcoordinator%2Fios%2Ffixed-inside-sticky-no-stacking-context.html&test=scrollingcoordinator%2Fios%2Ffixed-inside-sticky-stacking-context.html&test=scrollingcoordinator%2Fios%2Fsticky-overflow-no-stacking-context-stick-1.html&test=scrollingcoordinator%2Fios%2Fsticky-overflow-no-stacking-context-stick-2.html&test=scrollingcoordinator%2Fios%2Fsticky-overflow-stacking-context-stick.html

Result page: https://build.webkit.org/results/Apple-iOS-15-Simulator-Release-WK2-Tests/r284676%20(270)/results.html#

Diff: attached

Created attachment 442167 [details]
Image diff

[Radar WebKit Bug Importer]

<rdar://problem/84550781>

I was able to reproduce the image failure. The test passed with r284653 and failed with https://trac.webkit.org/changeset/284654/webkit.

Reverted in https://trac.webkit.org/changeset/284685/webkit