I was playing more and noticed the bug again.
I got it to repeat.

I added a new save file attachment. From my position on Fulgora with the new save. Press M then view Nauvis.
It plays the bug then.

I have a headless server with multiple surfaces. I get the screenshotted error message. I have uploaded the save file. It seems to be repeating. No consequence of the bug noticeable. Wondering what's happening?

2,000 hours user - first bug report

Thanks,
Magnus