Versions ("Latest" is NOT a version):

• Minecraft: 1.16.5
• Forge: 36.2.39
• Gaia Dimension: 1.3.3
• Client log: https://gist.github.com/mxnmnm/ce98b008be7d209aaea7005839a113f1

To Reproduce:
Steps to reproduce the behaviour. This is required for easier diagnosis:

1. Spawn malachite guard
2. Do /kill @e[type=!player]
3. Crash

I've attempted to reproduce this in 1.19.4, but I haven't stumbled across it.

There have been a few changes to how the Drones and Guards are handled, so it might be while I was porting, I had fixed the issue. Come to think of it, I may have fixed it in f51784d.