Something odd happened when a non-admin moved https://en.wikipedia.org/wiki/Draft:Reign_of_X to https://en.wikipedia.org/wiki/Reign_of_X at 10:48 (UTC), 19 January 2021.
Two moves were registered within a second and all revisions of the moved page at the time were deleted. I have restored them. As far as I can tell from page histories, logs, and deleted page histories:
Draft:Reign_of_X had 38 edits at the time and had never been a redirect.
At 10:48 Mr Scribbles666, an autoconfirmed user with 11 edits, moved Draft:Reign_of_X to Reign_of_X which didn't exist at the time.
https://en.wikipedia.org/wiki/Special:Log/Mr_Scribbles666 says, in an admin account with time preference showing seconds and newest logs shown first:
2021-01-19T10:48:13 Mr Scribbles666 (talk|contribs|block) moved page Draft:Reign of X to Reign of X over redirect (thank)
2021-01-19T10:48:13 Mr Scribbles666 (talk|contribs|block) deleted redirect Reign of X by overwriting (G6: Deleted to make way for move) (view/restore) (thank)
2021-01-19T10:48:12 Mr Scribbles666 (talk|contribs|block) moved page Draft:Reign of X to Reign of X (revert) (thank)
"G6: Deleted to make way for move" is an automatic enwiki move summary made by https://en.wikipedia.org/wiki/MediaWiki:Delete_and_move_reason
These are the logs you would expect if the second move had been to a redirect to the source with no other edits in the page history, meaning non-admins can overwrite the redirect per https://en.wikipedia.org/wiki/Wikipedia:Moving_a_page#Moving_over_a_redirect
At the time of the second move, Draft:Reign_of_X was a redirect left behind by the first move with no other page history. But MediaWiki claims Mr Scribbles666 deleted a redirect at the target Reign_of_X. At the time there should have been 38 revisions and never any redirect. As far as I can tell, MediaWiki deleted those 38 revisions with no other entry in the logs.
The first move, the alleged redirect deletion and the second move are consecutive within 31 total log entries that minute:
The two moves are also recorded in the page history of the source where they have two consecutive oldid and are shown 1 second apart. There were 186 oldid that minute between these:
Mr Scribbles666 was understandibly confused. Reign_of_X was now a redirect to itself with no other page history. He moved it back to https://en.wikipedia.org/wiki/Draft:Reign_of_X. This was an allowed non-admin move over a redirect. He and 220.127.116.11 (probably himself) tried some edits there which didn't help. 18.104.22.168 then asked for help at
That's where I came in. After a thorough investigation I restored all 39 deleted revisions at Reign_of_X. This was the 38 original revisions and 1 revision about the first move which was deleted in the second move.
I don't know whether Mr Scribbles666 did something unusual like double-clicking on "Move page". I didn't want to draw attention in case it could be abused so I didn't ask or indicate something strange was going on, and I'm filing this as a security bug.