MowFord

Note that i've updated the OP with a rework of this fix

> Looks like a rebase is needed on this one due to recent shift changes Understood. I'll catch up Monday

i believe the steps to crash are: - change drg/thf - call wyvern - zone in place - changesjob pup - zone in place - you'll see your old wyvern...

The crash condition i ran into appears to be uniquely related to using `!changejob` or `!changesjob` with a pet out. More details in https://github.com/LandSandBoat/server/issues/5441