I’ve just read the announcement post of the latest stable update at [Stable Update] 2021-04-28 - Kernels, Wine, Ruby, JDK, KDE-Dev, Mesa 21.0.3, KDE Apps 21.04, Python, Haskell, Mate 1.24.2, Virtualbox, Thunderbird, and it claims that
Mesa got fixed for issues reported on AMD graphics cards
Hopefully this is the case. I’ll try running a system upgrade.