Buckets of fish heal nautiluses much less than fish items

All buckets of fish heal nautiluses by 1 point of hp, but fish item heal 2 or 4.

Steps to reproduce:

1. Summon two nautiluses then tame them.

2. Deal 4 points of damage to each of them.

3. Heal with a bucket of pufferfish or a pufferfish item.

4. Run /data get entity <uuid of nautiluses> Health on each of them.

5. ❌ The hp returned is not equal.