Hi Steve, thanks for reporting it and posting the example.

There is a bug with some partial spheres (surface trimmed down from a full sphere I mean) in the current v2 beta, the way the bug happens it actually only messes up the mesher, the actual geometry itself is fine.

It actually was not a bug in the mesher itself though, it was a regression in the updated geometry library back from a couple of betas ago, which is why it doesn't happen in v1.

It's fixed up for the next beta, I should be trying to get that out next week I hope.

- Michael