From what I understand, this only popped up recently because of the test refactoring on May the 5th: https://github.com/xwiki/xwiki-platform/commit/24c1e6bd20f3df4933210791569337145dd502b7 .
We can see on our develocity instance that the test wasn't running before, and that now that it's running, it's failing on WCAG checks:
https://ge.xwiki.org/scans/tests?search.startTimeMax=1778580302383&search.startTimeMin=1759874400000&search.timeZoneId=Europe%2FParis&tests.container=org.xwiki.extension.test.docker.AllIT&tests.testContainerItems=class-configuration
