Expected behavior: Game either treats 4 'pixel' (unit) high corners as stairs or as a wall.
Actual behavior: You can run over 4 pixel high corners without jumping when moving one way (left to right), but not the other (right to left).
How to replicate: Go to this map http://www.plazmaburst2.com/?s=2&map=lpzimm-cornertest and try walking over the corner both ways. Direction you're facing does not matter.