Mining slaves in private mines disappear at logoff in said mine [AI][Low]

[Imrin]

Problem:
Slaves set to mine in a private mine disappear from said mine if the owner of said slaves logs off inside said mine. Slaves reappear in party when owner goes to map but are entirely gone from the mine upon fully logging off, where slaves stop serving their purpose of mining as a result.

To reproduce:
1. Go to private mine with owned slaves.
2. Tell them to mine resources.
3. Log off.
4. Log back on, observe as slaves are absent and therefore not mining.
5. Go to map, observe as slaves populate party.
6. Investigate inventories of slaves, observe as inventories do not possess appropriate resources.

Workaround:
Do not log off inside of your private mine when you intend for your slaves to mine resources in it.