Checkpoint fail in Temple of Kopec

when I died to the boss I respawned at the start of the map and not at the boss room checkppoint. I tryed teleporting with the checkpoint to the second floor, no problem, but as soon as I try to teleport to the boss checkpoint i teleport to the checkpoint of the first floor (start of the map) now every time i fail I have to go through the whole floor 2 again before I can try the boss again.

I'm having the same issue.