Didn’t try out what exactly caused the bug … it is either that the cell of the Bandit camp has not enough space for prisoners or some character is incompatible with the Bandits prison. (Was while having all party members inside the party using the add ally from the mod prison)
after escaping the bondage I couldn’t leave the bandit camp even after untying all ally’s that the game showed. it sayed something like you can’t leave someone behind