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BTRFS is currently not Journaling
https://lore.kernel.org/linux-btrfs/[email protected]/T/#m46f1e018485e6cb2ed42602defee5963ed8c2789
Qu Wenruo did a write up on some of the edge cases. Partial write being one of them.
What you just posted concerns the experimental RAID5/6 mode which, unlike all other block group modes, did not have CoW's inherent safety.
As it stands, there is no stable RAID5/6 support in btrfs. If we're talking about non-experimental usage of btrfs, it is irrelevant.