Ensure your you are using the latest versions of the iso-profiles - I suspect your shared package lists is outdated.
- $PROFILE/Packages-Live
- $PROFILE/Packages-Root
- $PROFILE/Packages-Mhwd
Ensure you are using the latest tools - no shadows in /usr/local (custom installation)
The ISO contains both ucode images
$ tree -L 1 /a/projects/build/buildroot/buildiso/kde/iso/boot
/a/projects/build/buildroot/buildiso/kde/iso/boot
├── amd_ucode.img
├── amd_ucode.LICENSE
├── grub
├── initramfs-x86_64.img
├── intel_ucode.img
├── intel_ucode.LICENSE
├── memtest
└── vmlinuz-x86_64
Upon installation mhwd will check the cpu and only the relevant ucode will be present after that.