Stuck in boss room act4 singing Caverns(chamber of echoes)

im stuck here now and the go to check point is not working..... wtf. this is bs i have the next two days off..

Did anyone figure this out? Won't let me respawn at checkpoint.

Actually if you press esc you can choose respawn at checkpoint.

Happened to me too. First time when boss dives off the arena, her(or is it "it's") healthbar disappeared and nothing happened. Luckily i could just respawn at checkpoint and on the second time everything worked fine, just wanted to report my issues for devs to know.