I think it was GZDoom where the absentee project owner suddenly came back, pushed a bunch of nonsense AI comments, so the entire actual development community just forked it again and left him to play in his sandbox? Now it's UZDoom.

Something similar happened with PolyMC to PrismLauncher but that wasn't about AI, it was an absentee owner who came back and deleted everything he said was woke.