I was playing on Windows 10, with friends (I was host). I was playing as Catti-brie, one other party member playing Bruenor.

We completed the mission and went through the screen that shows player ratings and then will return you to Kelvin's Cairn. After then choosing to return, it loaded me into the end of the mission, and then left me there. I saw my other party member despawn (and know he went back to camp) and then received the error "Cannot find friend session" (even though I was host!) and was stuck in the end of the mission. Going to the menu, I selected the option to return to Kelvin's Cairn (saying I would lose all rewards) but that also didn't actually let me leave, eventually had to crash the game through Task Manager to leave. Happy to say on reloading I did at least have my XP and loot (which hadn't been the case when I disconnected in a previous run).

I had expected to load back into Kelvin's Cairn, with my rewards.

So far I have played 3 missions, got disconnected in one, completed the second successfully and then this. I am really enjoying the gameplay, so I think it would be great to have an option to rejoin or retain progress/loot if disconnected as having to replay, wondering if you are going to disconnect again before you can see what you got takes the shine off the otherwise fun game! Glad to see that if you make it to the completion window it does save at that point even if it then crashes.