bsdtar(1) can't extract new ISO images

It's often convenient to extract pieces of iso9660 images for recovery
purposes or a jail. As libarchive no longer recognizes them one has to
resort to mdconfig + mount_cd9660. On a zfs-only system this populates
bufspace unused by arc cache and never gives memory back... nevermind.

  $ tar tf FreeBSD-9.0-BETA1-amd64-bootonly.iso
  $ cpio -ti <FreeBSD-9.0-BETA1-amd64-bootonly.iso
  2 blocks
  $ tar tf FreeBSD-8.2-RELEASE-amd64-bootonly.iso
  .
  boot
  boot/zfs
  boot/firmware
  boot/kernel
  ^C
  $ cpio -ti <FreeBSD-8.2-RELEASE-amd64-bootonly.iso
  .
  boot
  boot/zfs
  boot/firmware
  boot/kernel
  ^C

I think it's also reproducable on daily snapshots from allbsd.org
/stable/8 vs. /head. So, does this count as regression?
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