Sadly, I found some bugs that are enough to warrant this removal:
-> Sometimes, even if the sprite is set to be caught by a Blue Shell-less Koopa... the spiny shell can still kill it;
-> When eaten by Yoshi, it behaves strangely;
-> The main removal reason: Its interaction with Mario is janky when he has a Star; you can get a ton of 1-ups out of it, and the sprite does not die.
That's all I've found. Eventual questions, I'm available in Discord (low activity, but I can still answer).