Thanks! I'm having trouble reproducing this one, but hopefully can figure it out. Have you experienced anything like this more than once or in a different place to the final boss? Trying to figure out if it's specific to that or something else.
The physics fixture created to hold the player in place was sometimes being destroyed erroneously by various item scripts for things in the player inventory
I believe it was due to some items conflicting with the physics lock on the hero and because the boss is transitioning/spawning, the hero falling at that time causes a break in the logic. Will push it out soon!