I noticed this starting after the April CU. I thought it was a bug at first, but when it happened twice more, I thought the Windows welcome experience option had been re-enabled, as Microsoft is wont to do, but it's still unticked in Notifications. I haven't come across any articles or forum posts describing it either.
Maybe try enabling and disabling it in the registry and it might go away?
I have not seen this before.
I have on a couple of machines with clean installs of windows too