And corruption actually happens. My Dell has an Sk Hynix NVMe drive that apparently doesn't have safe write on power failure. I know because it somehow woke up

And corruption actually happens. My Dell has an Sk Hynix NVMe drive that apparently doesn't have safe write on power failure. I know because it somehow woke up in my bag and ran the laptop battery down to 0. BTRFS was not happy with the state of anything on the drive. I was able to do a rescue copy and verify it with my backups, so after a full restore everything turned out OK.