1. What did you do? Super force built (ctrl+shift+click) the bottom section of belts on top of the single belt line above it.

2. What happened? While super force hovering (ctrl+shift, but no click yet), an underground belt is displayed as a ghost entity. outside of the copied section. This entity ...

Ah, actually, you're right, this is an older section of the map. It must have been generated before the update. Thanks for pointing that out.
I'm dumb. Oh well.

This is more an annoyance than a bug per se, but with the new water/ground transition graphics 1 tile ponds are nearly invisible. In the linked screenshot, there is a pond to the left of the cursor, which prevented me from placing a miner where I wanted it. This wasn't so much of a problem before ...