- Assign a buildable that is not present in your inventory to your toolbelt.
- Pick that buildable (either hotkey or click the gui). This correctly pick the ghost if the config is on.
- Press Q, or the hotkey of that buildable, or click the gui to drop the ghost. The ghost is removed from your cursor, but its icon on toolbelt still has an orange background, i.e. selected.
- Try to pick that buildable by pressing hotkey or click the gui.
What happened: Nothing.
Actually, you can now pick any other buildable, either as ghost or actual buildings, just not this particular buildable that was just picked up.