It seems that there might be an issue with V3 and icon support on Xsight remotes
I upgraded to version 3, and then I updated a couple things on my Xsight color. Unfortunately, all icons no longer work with this. I went back to version 2.14.16 and made the changes there, and all the icons came back.
You are correct, there is a bug affecting icons in v3.0.0. I am working on it, having found myself, a few days ago, that there is a problem. But please report bugs in the RMIR Announcement thread in the JP1 forum, I do not regularly monitor these support tickets.