[Autumn]

I can provide a bit of insight to this bug, these tiles are caused when monsters or players are knocked around way too far, whether by stuff like Rising tide -> Chaser, or Mad Chop, or Heavy tackle, either way, if a skill knocks you back something around 6+ tiles, this little bug happens sometimes, it just flats out makes the tile like a wall or an object, you cannot teleport to it via Crane hop or other methods.