KLD amdgpu.ko: depends on kernnel - not available or version mismatch
linker_load_file: /boot/modules/amdgpu.ko - unsupported file type
# uname -a
FreeBSD freebsd 13.0-CURRENT #0 r360211
# pkg info drm-devel-kmod
It looks like your kernel and the drm kmod is out of sync. You need to recompile drm-devel-kmod (or drm-current-kmod) from ports after upgrading your kernel on FreeBSD CURRENT, to keep them in sync.