On the x86 platforms, grub is not part of the base-system package anymore. That means that after upgrading base-system to 0.94, grub will be detected as an orphan. If you are using grub, please change it to manual installation mode to keep it:

# xbps-pkgdb -m manual grub

for x86, or:

# xbps-pkgdb -m manual grub-x86_64-efi

for x86_64.

This is in preparation to support other bootloaders in the future.