Running ActionDestroyFormat on disk with a GPT disklabel doesn't destroy the PMBR record. Result of this is that blivet see the disk as empty (without disklabel) but can't format it to btrfs (or ext4 or any non-disklabel format type) because we call the mkfs command without using "--force" option. We are using libparted method "ped_disk_clobber" that doesn't destroy the PMBR record.
I had to fix this on uevents-branch. I can make a pull request to bring that to master.
https://github.com/rhinstaller/blivet/commit/9bee7679
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