Can't join Sandbox Mode with party anymore (Edit: as Viscous)

[Mrkarton]

View attachment Deadlock 2024-09-13 10-18-25.mp4
It's just stuck on "1 player in Queue" Instead of instant join like before the update.

 

[Mrkarton]

I tested it more and its just because I selected Viscous which I think is temporarily disabled in matchmaking.

I can still enter it as Viscous on my own but not with a friend.