I played a game against it yesterday (it won) and the only time it made an ilegal was move 15 (the game was unique according to lichess database from much earli

I played a game against it yesterday (it won) and the only time it made an ilegal was move 15 (the game was unique according to lichess database from much earlier) so I just asked it to try again. There's variance in what you get but your example seems much worse.