just tried to update system, but there were errors with /usr/lib32/libwayland-egl.so and update failed.
The errors were related to already existing files:
/usr/lib32/libwayland-egl.so /usr/lib32/libwayland-egl.so.1 /usr/lib32/libwayland-egl.so.1.0.0 /usr/lib32/pkgconfig/wayland-egl.pc
I simply removed those files and directly updated again, no errors anymore.
So this seems to work around the real problem, whatever it is.