Since T128914 users with deletedhistory permission but no deleterevision aren't allowed to access SpecialRevisiondelete.
As a result, link for "show" (Linker::revDeleteLink) points to unallowed page.
This should be fixed either by changing DifferenceEngine.php to use a different method when user have only deletedhistory, which will point to diff with ?unhide=1 or to reallow users with this permission to access SpecialRevisiondelete.
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