wattson fence placement

hi i just noticed some   wierd stuff with  wattson fences   i tried to replicate them in  fire range ..
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i cant connect the fence nodes   if an enemy is between the  2 fence node:
video : wattson fence bugged2

i cant grab my fence node if is behide an enemy :
video: wattson fence bugged

and i cant place my  node behind the enemy   because hes blocking  the node placement:
video: wattson fence4

thanks