A Microsoft file hosting and synchronization service.
After suffering with this issue for months on my Win10 PC, it has just corrected itself! It happened sometime in the last 2 weeks, but I'm not exactly sure when because I have been out of town. I do see that the monthly cumulative update was installed on 5/15 (KB5058379 for my 2H22x64 version) and I verified that there were OneDrive files included in that update, so perhaps that had some impact. I don't recall that I checked the status of this issue just after the update reboot before I left town, so I can't say for sure unfortunately.
Don't know why it only affects some installs, but there IS hope as others have said...