I have the same issue with lima drivers on tv-box(S905X). I think the problem is in mesa 20.3 (the same with mesa-git)
Previously, when the glmark2 was launched, there were no such messages:
I switched to mesa-20.2.3 with the command:
sudo pacman -U /var/cache/pacman/pkg/mesa-20.2.3-1-aarch64.pkg.tar.xz
Now I have a performance boost (~ +50% more frames with glmark/glmark2-es2) with mesa-20.2.3 and kernel 5.10.
How to switch to the wayland? I installed plasma-wayland-session but have black screen after login …