When oldid is specified, all messages shown have the content of the top one.
For example, compare this:
https://www.mediawiki.org/wiki/Thread:User_talk:Peachey88/Woa,_why_all_the_deleted_pages%3F/reply_%284%29
With this:
https://www.mediawiki.org/w/index.php?oldid=539525&rcid=611053
Other examples:
https://www.mediawiki.org/w/index.php?title=Thread:User_talk:Peachey88/Woa,_why_all_the_deleted_pages%3F&oldid=520001
https://www.mediawiki.org/w/index.php?title=Thread:User_talk:Peachey88/Woa,_why_all_the_deleted_pages%3F/reply_%283%29&oldid=539501
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Severity: normal