You’re right. I restored again the timeshift snapshot from before the update, repeat all the update except these ten packages and after the reboot had no problem, no artifacts, VLC plays AVI again.
lib32-libva-mesa-driver-1:23.3.3-1
lib32-mesa-1:23.3.3-1
lib32-mesa-vdpau-1:23.3.3-1
lib32-vulkan-intel-1:23.3.3-1
lib32-vulkan-radeon-1:23.3.3-1
libva-mesa-driver-1:23.3.3-1
mesa-1:23.3.3-1
mesa-vdpau-1:23.3.3-1
vulkan-intel-1:23.3.3-1
vulkan-radeon-1:23.3.3-1
So I’ll include these packages in IgnorePkg from pacman.conf and wait for the next mesa release to see if works well. Thanks!