Watching for changes encountered an event outside of the filesystem root: f.root==\\?\R:\, root==r:\, path==\\?\r:\.

I had this message today:

“2019-09-05 11:12:17: Watching for changes encountered an event outside of the filesystem root: f.root==\?\R:, root==r:, path==\?\r:. This should never happen, please report this message to forum.syncthing.net.”

I hearby did [report]! Please let me know if any additional info is needed.

What version of syncthing?

v1.2.2! I did restart it and the message did not come back.