Closed Polysurface with Holes

Rhino Rhino for Mac
1

I opened an previous version of a file I was working on and found this “solid” in it. It has these two holes.

Everything I have tried tells me this is a good polysurface.

I presume this is a bug so I share. I have no idea how I created this. However, there supports to be surfaces extending from where the holes are similar, but large then then bent pipe to the left.

30%20PM
Screen Shot 2018-02-07 at 3.40.30 PM.png934×940 221 KB
Problem Holes.3dm (6.9 MB)

2

Hello - there are two coincident surfaces there.

-Pascal

3

In playing with the file I was able to find the source of the problem:
Problem Holes 2.3dm (3.7 MB)

Here is the starting point of the problem. There un unjoined edge between the upper and lower sections. Doing CAP on this produces two surfaces.