Unfortunately, it seems like the mines are still not emptying in the “Ship got real” update.
Build Number / Patch Number:
Type of Bug:
Result of Save/Load:
No, at one point I was able to save/load with the mines working fine.
Mines will fill up and employees will never pick them up
Not exactly sure what causes it, but it seems like if you build any mine it eventually runs into this bug. I workaround this by destroying the mine and building it in a new spot (it seems like the bug persists if you rebuild it in the same spot).
If I had to guess, it might have bugged after either building a smokestack or a monument, but I would need to retry this again to be certain.