I can't find it anywhere. I need to know where it is because I have a working addon that only needs the bucket code working. when I bucket one of my added mobs, the game immediately crashes. Everything else works except the name of the bucketed mob and the bucketing itself. I have checked in the resources and behavior files of 1.17, 1.17.10, 1.17.20, 1.17.30, 1.17.40, 1.18, 1.18.10, 1.18.20, and 1.18.30.
None of those files show any bucket code.

I can give more specifics, and even a download if you need. It will crash your game the instant you bucket a modded mob.