Hi Petr, there was a bug in styles handling which could easily be run into with the Planar command when capping holes.

If the new capped face was only surrounded by a single neighboring face (like when capping a cylinder hole for example), that would not take on the neighboring face's style like it was supposed to.

You don't really run into that with filleting, since a fillet goes between 2 other faces, but you could run into it pretty easily with Planar for end caps.

That's fixed up for the next beta.

I'll see if I can make a bit clearer description for you about how the style assignment works for new faces like with Fillet, it is based on some of the previous discussion here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=2843.37

- Michael