Original COH world builder had Shot Blocker only objects, but they aren't in COH2 world builder. I found it very unfortunate because of the size of the shot blockers create a lot of impass.
One thing I never tried was making the blocker a VIS object only, that would kill the impass, but I'm not sure if it would keep the LOS and Shot Block.
I will try this, and see if it works. I made a similar map for vCoH, so I was surprised when it didn't work like before.
Thanks for replying