I've added a note about this to the release notes:

 * If btrfs is used for `/boot`, then the gap between the start of the
disk and the first partition must be more than the traditional 63
sectors.  A good modern default is 1 MiB. (Bug:774217)

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https://bugs.launchpad.net/bugs/774217

Title:
  btrfs, core.img too large

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