Zombie nautiluses drop rotten flesh even when not killed by the player

The bug

When a zombie nautilus is killed by natural means, it drops rotten flesh. According to MC-307184, they should only drop rotten flesh when killed by the player.

How to reproduce

1. /summon zombie_nautilus ~ ~30 ~

2. Run it a few times and let them fall and die

Expected behavior

No rotten flesh is dropped

Observed behavior

Rotten flesh is dropped