How to reproduce:
- Place both ends of an underground belt in free-space. Either free-placement, or copy+paste.
- Rotate one end. No connection will be shown between the ends. (Because the space platform isn't real?)
- Place space platform underneath.
- Mouse over each end in turn, note that the arrows show opposite directions.
- Use the 'Rotate' key to flip one end, note that the arrows flipped at both ends.

