Joining an already cleared dungeon?

This has happenned to me 3 times already.

I get in queue for a dungeon and select the "Join Session in Progress". When I get in, there is the "Victory Fanfare" playing and the dungeon boss has been killed and people are leaving the instance.

Today, I was the leader of an Amdapor Keep group and cleared it with them. When 1 party member left the dungeon, a window popped asking me if I wanted to look for another member even though the dungeon was completed.

Is it possible to eliminate that "do you want new members" window when the dungeon boss has been killed? or when someone uses the last telporter to exit the dungeon?

That would be greatly appreciated.

yes this is very annoying happened to me alot, of course it only happens when you choose to enter PT in progress. Still even so jumping into a finished instance doesn't make any sense at all SE.

plz fix this

I don't even click on "Join party in progress" because of these reasons. its a joke