Hello. This may be due to the fact that the ability to build+install some ports at the same time as buildkernel+installkernel is still incomplete. Any fixes for the next report of Bugzilla are expected to improve flavor support and parallelization performance.
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237290 Still, a package of kernel modules is required for the kernel binaries provided by snapshot installers and security fixes. This is because kernel modules with mismatched osversion cannot be loaded. Should I have such a perception? :) Regards.