Garrison waypoint cursor can be incorrect

[wowgetoffyourcellphone]

If I set a waypoint from a barracks or other soldier producing structure to an enemy structure the cursor is always attack, setting an attack command for the outcoming units.

But if that building is unattackable (it can only be captured for example), the newly trained units will just stand there in front of their trainer building. Expected Behavior:

That waypoint cursor should have changed to capture in this instance and the exiting units should have gone to go capture that building.