I had to unhijack GNN to complete a quest in the vanilla GNN building. Doing so reverts the map icon to the radio tower and the fast travel point to the road outside, which is the normal state for vanilla. When re-hijacking GNN so I can interact with HQ, the map icon doesn't change back to the HQ icon and the fast travel point remains outside on the road. Not a deal breaker by any means, but probably unintended.