Due to uname(3) setting machine type to what uname -m prints, we currently have various ports issues with e.g. Python, Perl or Firefox. There is proposal in https://reviews.freebsd.org/D35962 to change the machine type in uname(3). This would benefit powerpc*, riscv* and armv* platforms. Please perform exp-run on arm64 / aarch64 machines with the patch from the above review. amd64 or i386 machines here can't be used since they won't be affected by that patch.
There is no arm64 hardware available for exp-run. All of them are used for production packages.
^Triage: D35962 was committed Jul 27 2022.