Ritual breaks when Activated during Boss fight in Pit Map

Bug-ID: 3.837.893.744

Hello GGG,

I've encountered a Bug in the Pit Map which breaks Ritual encounters. The bug has occured to me multiple times now and is easily replicable.

Description:
Starting the Ritual while fighting the boss of the map locks monsters, which are invulnerable while waiting to spawn, into the Ritual. These monsters stay invulnerable even after they have spawned and break this and following Ritual encounters of the map.

Here's a video of this happening: https://youtu.be/bkDQNE8YCdI

As can be seen, the Ritual before fighting the boss worked as usual, the Ritual with the boss and the following encounter got broken by this bug.