Current workaround until upstream bug is fixed (works for me):
 If you mount the btrfs root (without specifying subvol=@...) to e.g. /mnt then 
you can use  btrfs send successfully 
e.g. 
btrfs subvolume snapshot -r /mnt/@ /mnt/snapshots/YYYYMMDD-HHMMSS-@
btrfs send /mnt/snapshots/YYYYMMDD-HHMMSS-@ | btrfs receive /backup
(/backup being the 2nd btrfs volume to which the snapshot shall be sent to)

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https://bugs.launchpad.net/bugs/1348430

Title:
  btrfs send does not work for snapshots in subvolumes

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