These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.83 s (backtrack: 0/20).


!!! All ebuilds that could satisfy "=sys-boot/plymouth-24.004.60-r1" have been masked.
!!! One of the following masked packages is required to complete your request:
- sys-boot/plymouth-24.004.60-r1::gentoo (masked by: package.mask)
/Volumes/Disk 1/Repository/portage-git/profiles/package.mask:
# Nowa Ammerlaan <nowa@gentoo.org> (2024-10-05)
# This version is known to break on certain systems. At the
# same time it fixes several reported issues. Masked until
# we can work out how to resolve the situation.
# See also: https://github.com/gentoo/gentoo/pull/36091


For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.