Hello and thank you for your quick response.

This is not surprising as mirrors on any vehicle currently don't work in game. Since the viewports all use mirrors they don't work.

changed how to reproduce the issue as the previous way was incorrect.

Can confirm in this instance it is the AI soldiers, they don't need to be "in" the build zone, only close enough to it that it blocks it. The same is true for players. you will notice the Russian soldier on the road on the left side of the submitted image. That is close enough that they will be "in the way" when trying to build the armory

For use on controller you could have the throwing strength be set by how much you press down on the right trigger, then use left trigger to initiate cooking.