I noticed this little issue with special:undelete. To reproduce this you have to be admin; if you are on Beta Cluster, you can just go here and skip to step 7, otherwise:

1. Create a page and make two edits (so that it has 3 revisions)
2. Perform a revision delete on the second revision
3. Delete the whole page
4. Create it again
5. Go to the history, then click on "View or restore xxx deleted edits?"
6. Click on the version that you previously RevDel'ed
7. Check out the message at the top: "This page revision has been deleted. You can view it; details can be found in the deletion log."
8. Click on "deletion log"

You should be sent to deletion log for that page, but you are instead sent to deletion log for "Special:Undelete". This is because the revision is shown on Special:Undelete and the involved system message (rev-deleted-text-view) makes use of {{PAGENAME}}. The fix shouldn't be hard, but I don't know whether I'll be able to do it myself. BTW, repro steps could possibly be simplified but I didn't even try, since the problem is already quite clear.