Re: [cross-project-issues-dev] Multiple version of org.eclipse.sdk.feature.group in the 2022-06 simrel
As Ed wrote, reverting was the only way to fix your IDE, when a milestone was broken. And for reverting you need the old update site. I've done that multiple times.
However, since oomph this is probably not needed anymore, since we are now used to just doing the installation again. With that in mind, it might be possible to get rid of composite milestone update sites.