Describe the bug
Lamprey despawns after killed mobs.

To Reproduce
Steps to reproduce the behavior:

1. Spawn lampreys
2. Spawn other mobs
3. Lamprey disappears

Versions:

• Windows
• MC Version:1.12.2
• Mod Version:6.0.1

Hmm... I tried, but it didn't happened...
But sometimes lamprey disappears. I don't know why it happened...

Hmm... they disappeared near from me.
Maybe it may just be my mistake.

Closing this unless it happens again.

It probably despawned naturally as most entities do when unloaded. Is that fine or should I disable it?