i simply had this prob ages ago. mainly the grass sections.
i tested out lots of segments and found some worked and some made enemies walk in the square only, so i copied the working ones and changed the texture this worked.
if it is the zombie apoc pack they dont work properly but with some tweaking im sure will work... it will be the scripts (probably due to the speed of them) i worked on some wraiths not too long ago and found slowing down or speeding up too much made them stop. so maybe play around as to dark ai should just work in the main ai. and just choose enemy allie or neutral.
hope this helps
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