it is now a non issue
IMHO it's still a big issue that might lead to data loss to someone else. The Windows client should be hardcoded to refuse syncing in onedrive folder.
Someone should reproduce this in a VM and open a GitHub issue
Edit: they already know this since a couple years, and the same happens on MacOS https://github.com/nextcloud/desktop/issues/4276
One day I had a power outage and I wasn't able to mount the btrfs system disk anymore. I could mount it in another Linux but I wasn't able to boot from it anymore. I was very pissed, lost a whole day of work