This fence has an area where it can be walked through, and cutting through it is an invisible slope. I've looked at the map file in zones.pk3 and the fence is set to be solid, and has [7] No Midtexture Skew set. Turning off this flag shows that when skewed, the fence matches the shape of the invisible slope.
Turning off [7] No Midtexture Skew has this result:
Turning off [7] No Midtexture Skew has this result:
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