Second bug of the day

Second time I see this bug

Won't post the file because it will always happen on a different location for every file, making a generic solution mandatory.

It's not missing the base plane

I zoomed out a lot

Every dependent sketch is shown (although I know that the cause was a missing plane with no sketches)

Update:

Amazing !

I deleted all the lines on the problematic sketch, leaving a single one, and the problem insists on staying there.