You are hitting the issue @kensanata encountered in Autoremove linux-image-6.12.25-mnt-reform-arm64
The workaround is to manually edit /var/lib/dpkg/info/linux-image-6.14.5-mnt-reform-arm64.prerm as well as /var/lib/dpkg/info/linux-image-6.14.5-mnt-reform-arm64.postrm.
Change linux-run-hooks prerm "$*" $version $image_path to linux-run-hooks image prerm $version $image_path -- "$@" in the first file and change linux-run-hooks postrm "$*" $version $image_path to linux-run-hooks image postrm $version $image_path -- "$@" in the second file.