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

Calculating dependencies ...

!!! Problem resolving dependencies for =x11-misc/grub2-theme-preview-2.9.1
 done!
Dependency resolution took 0.83 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "=x11-misc/grub2-theme-preview-2.9.1" has unmet requirements.
- x11-misc/grub2-theme-preview-2.9.1::gentoo USE="-test" GRUB_PLATFORMS="-efi-32 -efi-64 -pc" PYTHON_TARGETS="-python3_12 -python3_13"

  The following REQUIRED_USE flag constraints are unsatisfied:
    any-of ( grub_platforms_efi-32 grub_platforms_efi-64 grub_platforms_pc ) any-of ( python_targets_python3_12 python_targets_python3_13 )