AI's Brain can only be removed once

[T-man]

This is literally just the title. You can remove the brain (and put in a new one) just fine. However, when you try to pull the new brain back out of the AI, you just can't. Additionally, you can't reseal the AI afterwards- Crowbar and wrench just hit the AI very rudely.

Speaking as someone who just mindswapped with the AI, I think this is a bug.

((PS. Make the AI chassis reproducible mysterious AI improving coder))