Gold mining exploit
When playing with allies, one can steal their gold by dropping a worker onto their territory and mining the gold seams intended for them in Possession endlessly, because it is transferred directly to your Dungeon Core.
Game Version:
Steam Public
Platform:
Windows
As said at another report. There is plenty of ways to damage an allied player.
You should not ally with anyone you don't trust.
Limitting these things would limit also ways to cooperate with your ally.
This is not a bug.