Display problems of REGIONS produced as Sections od a 3D Solid (ACIS)

Hi,

by sectioning a 3D Solid (torus) several Regions are created.
Some of them (colored red) are not displayed properly as closed contours (see the red regions in screenshots and attached DWG).
It really seems to be a display problem of 2 Shademodes, 2D wireframe and 3D wireframe.
All other modes display correctly.
The problematic display of the Regions shows up in 14.2.9, 14.2.10  and 14.2.11  versions.
In the 13.x versions the Regions are displayed properly, so it is really a display problem of version 14...?

In the attached DWG you can reproduce all the problem Regions by using the command SECTION on the Torus
and selecting 3 Points on one of the red (problem) Regions (Sections).

Any ideas about the problem ?