Rights conservation error in AMM

[katelynsills]

Describe the bug

We were getting a rights conservation error, which I think is probably a duplicate of #3800. In other words, an offer safety error occurs, then because the pool seat isn't cleared, a rights conservation error occurs. I'd like to confirm it's actually the same bug though, before closing this.

Screenshots

First offer:

Second offer:

[Chris-Hibbert]

This is an instance of #3850 "Stateful seats and staged allocations".