The imageStyleAdministration failures currently seen on the CI are a different failure from the one reported here, and this one (the "Create the image style" button never becoming enabled, at ImageStyleAdministrationPage#submitNewImageStyleForm) has since been mitigated by commit 2343cf7d9db.
Every failure of that test on master since July 2026 fails later, at ImageStyleAdministrationPage#getDefaultStyle, with NoSuchElementException: *[name='Image.Style.Code.ConfigurationClass_0_defaultStyle']. The archived screenshots show the section rendered with two literal $escapetool.xml($property.translatedPrettyName) labels and both configuration fields missing, and frames from the failure video show the section is already broken on the first visit to the administration, more than 20 seconds before the assertion fails. It is a server-side state problem, not a UI wait problem.
Root cause analysis is in XWIKI-24778.
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