Simple datapack that randomly changes the size of entities using the new generic.scale attribute. Mobs have around a 1/10 chance of being an odd size, with a minimum of being 40% their original size and a maximum of 200% their original size.

Latest snapshot required, or 1.20.5+

IMPORTANT: If you load this on a pre-exsisting world it will change the sizes of exististing entities, which could cause the entity to suffocate under certain conditions. MAKE A BACKUP OF YOUR WORLD BEFORE ADDING THIS DATAPACK.