... Try blocking those tiles off...?

Though spawning more Puchi and moving faster sounds like a fifth-tier Haste spell was cast upon it... :-b

Not quite sure why those particular tiles would crash the game, though...

... Now I really dislike this year, because now I really want to test this out for myself with the "try it out personally" method that Charlie used previously... :-b

But in some seriousness, maybe block off the game-crashing tiles during the boss fight...? (CMP and solid tiles... or tile 0 to remove, after the boss battle...)

More research into the major bosses is warranted, but the Lunar Tierce Research & Development Centre is closed until things get better here... :-/

First thing to do with Internet: release Charlie's test zone mod...