The AVIF images are displayed as broken images. And this is why they are not marked as passed on iOS.
<rdar://problem/102534920>
<rdar://problem/102490238>
Pull request: https://github.com/WebKit/WebKit/pull/9495
Committed 259819@main (ca9f53c112bc): <https://commits.webkit.org/259819@main> Reviewed commits have been landed. Closing PR #9495 and removing active labels.