Rhoa mount (and character if mounted) gets stuck in Overgrown boss room

Bug Report ID: #430075185

I killed the boss and wanted to come back out to finish the map. I got caught on an invisible wall and could not leave the boss area. I dismounted the rhoa and was able to pass but my rhoa was still stuck behind the "wall".

Of course it respawned after travelling a screen or two away as usual, thankfully.