BUG: UI Button rendering broken in compiled game on Windows

using 2021.1.0b8 on Wondows 10 (insider preview) with older AMD GPU

I have in UI / Camvas / Button with RAW images. Round buttons with transparent areas in the corners.

Editor: all looks fine.
compiled game for Windows: the graphic is not shown, the complete area is magenta… PNG does NOT work, GIF is fine!

Th text overlay works fine.

Hi @JU52 ,

Did this aspect of your project use to work with previous Unity versions? Are there any errors being thrown in the build?