Wicketstuff most of the time simply follows upstream changes but these ones seem to be unwanted side effects. The two failing tests:
This is the result of commit "revision: 1151831,
WICKET-3931 Component markup caching inconsistencies", because if I remove the "internalDetach();" call in o.a.w.Component.detach() the test in minis passes again (but o.a.w.markup.MarkupVariationTest.changeVariation() fails).
This started to fail in my env at the same time as the other (yesterday) but I couldn't find the cause for it yet.