dangerous skull cavern

Hi ! We've got an issue in a multiplayer game 1.6 We accepted the dangerous mines mission. We haven't completed it, but once the quest is gone, the skull cave is still in a dangerous version. Is there a fix ?

you can invite people that you have given a flower bouquet to the mines (you can invite some people to the quarry mines, only a few to the skull cavern and only one to the volcano dungeon) Emily: can be invited to the mines (she will go to a maximum of 93 levels) and skull cavern (max 25...