Walking diagonally you can climb low fences when going North West (W&A+E) or South West (S&A + E)
Doing the same thing going North East (W&D + E) or South East (S&D + E) does not work.
This is not a specific fence somewhere. This killed me 2 times already, before I started a game to test hopping over fences and found this out. I would love for this to be fixed, since I see myself doing the same thing again.
Cheers.