Tried to shoot at a Command node from point blank with a yagel ->
the weapon fire was nicely aiming at something in the vertical center of the structure, but the Combat log showed "target obstructed by obstacle"

moving to another node, trying same, got the same result

then moved further away from the node and suddenly i was able to deal damage, but the shots where visually aiming at the ground-tile the building was placed on.

in either case i had locked the building, not the ground tile.