Looking for a cosmetic thread texture to place in threaded holes as cosmetic thread does not work.

As you can see from the pictures below, the cosmetic thread does not work with the different sizes nuts using the design table.  As each time I add a different size nut, the cosmetic threads texture disappears and put them on only one size nut. Looks like a bug in the software.

Questions:

1- So my alternative is to place a thread texture on the nut inside surface. How do I find textures for threads and other textures maybe nice to like machine surfaces?

2- How to report the bug to the SolidWorks company?

Thread texture only works with one nuts size at a time. If I click to modify the small nut, its thread will show, but the medium and large will not show.  Note the dotted circles for the cometic thread sizes changes properly, just the picture has a problem.  metic nuts... some French standard that is popular. The USA adopted metric in the 1890's, but forgot to tell their people.