I can't use 3 of my team members; mc, Tamamo and Murdock. I send them on a hard assignment, wanted to send the police girl too, but the assignment didn't disappeared and I send a new team. Now they're gone forever. It looks just like it would usually in the character menu if you send them away. Greyed out and you can't interact with them. I'm on both the first snow mountain quest and the golem one. Almost beat the second one while being level 20.