11051 zfs miscounts BP_IS_EMBEDDED blocks during scan.
illumos/illumos-gate@ee2f9ca4ea24f72b05598c92aad7f42fb77b1345
https://github.com/illumos/illumos-gate/commit/ee2f9ca4ea24f72b05598c92aad7f42fb77b1345
https://www.illumos.org/issues/11051
Author: Bill Sommerfeld <sommerfeld@alum.mit.edu>