Tamriel Rebuilt for Morrowind may have both beat, although to be fair that has been in development since before Morrowind came out over 20 years ago. Modding has become a lot more organised since then.
ETA:
The Fallout 4 update, which is supposed to add official support for the Steam Deck, has broken the game on the Steam Deck.
Bethesda. Bethesda never changes.
