Seems similar to something blackarch ignores:
$ sudo pacman -Fyx pamac
:: Synchronizing package databases...
mesa-nonfree is up to date
core is up to date
extra is up to date
multilib is up to date
error: mesa-nonfree database is inconsistent: version mismatch on package lib32-libva-mesa-driver
error: mesa-nonfree database is inconsistent: version mismatch on package lib32-mesa
error: mesa-nonfree database is inconsistent: version mismatch on package lib32-mesa-vdpau
error: mesa-nonfree database is inconsistent: version mismatch on package lib32-opencl-clover-mesa
error: mesa-nonfree database is inconsistent: version mismatch on package lib32-opencl-rusticl-mesa
error: mesa-nonfree database is inconsistent: version mismatch on package lib32-vulkan-intel
error: mesa-nonfree database is inconsistent: version mismatch on package lib32-vulkan-mesa-layers
error: mesa-nonfree database is inconsistent: version mismatch on package lib32-vulkan-radeon
error: mesa-nonfree database is inconsistent: version mismatch on package lib32-vulkan-swrast
error: mesa-nonfree database is inconsistent: version mismatch on package lib32-vulkan-virtio
As with the open blackarch issue it does not seem to impact functionality.