Hi FDP,

> I had noticed the occasional surface void in this project before this problem, but assumed it was
> a viewport error (those seem to occur in V2 on rare occasion).

It's possible for something like that to be a bug in generating the display mesh, but usually it means there's some problem with the trimming boundary.

If you go to export it to a mesh format like OBJ for example, and the export mesher also made a weird looking result in that same spot, that makes it even less likely to be just a display problem.

- Michael