Killing Map Bosses too fast can lock you inside their arena

So far I've had this happen on maps with Tetzcatl and on Castaway Unique Map.
My usual combo is stun boss -> burst kill within the stun window. Arena always locks on specific bosses when doing this, with the red wall staying. No way to access checkpoints.

Castaway Bug ID: 2,894,315,558

Assembly Bug ID: 1,500,382,732