Cylinder contour fix

Hello,
I have a hole in a workpiece that does not result in a "clean" contour.
In the image we see that the top edge is slit in two parts (1 and 2 in the picture), making our post-processing difficult.

Is that to be expected ? Is there a ShapeFix to fix this ?

In CAD assistant it seems to "display" correctly. I cannot manage to see if the top edge is split in two.

Thanks in advance