Terrain generation causes inaccessible map boss

Layout is Frozen Falls
Reference ID: 540 397 378
I can't move any further up/right into the tunnel leading to the boss. The terrain boundaries in the minimap seem accurate. The checkpoint by the entrance is a boss checkpoint, so I assume this would be the normal way into this boss area. I've explored the rest of the map with no other issues

edit: I managed to use Pounce to get past the blocked area