The original FreeBSD-14.3-RELEASE-amd64-zfs.raw.xz image had a broken ZFS
filesytem which triggered a kernel panic.  That image has been removed from
download.freebsd.org and a new FreeBSD-14.3-RELEASE-amd64-zfs-rebuilt.raw.xz
file has been added.

See bug 287482 and
https://lists.freebsd.org/archives/freebsd-stable/2025-July/002902.html
for more details.