This commit seems orthogonal to what I did now for XWIKI-18770. This commit seems to account for a case where groups or users are stored in rights with absolute references instead of relative references even though the user/group is from the same wiki. I don't know for what use case this is necessary but we could also apply this to complement my fix that should already cover the main problem that is described in the main issue description (as verified by integration tests that test exactly the described scenario).
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