LivingHurtEvent would likely fix this issue. Depending on the size of the entity, you can get more experience (like Slimes).

Might only be critical in creative, though I'll test thoroughly in survival too.

I'll likely leave it as is, and add an exception for Slimes and Magma Cubes (the only ones causing the bug).

I'd still like to fix it in the future, but this should be fine for now.