This just in - (Well, fairly recently, anyway. 10/11/18 in Freedom Date Format)
Microsoft Fixes Bug That Deleted Files
According to the article, the fix was not distributed at that time, four days ago. Something to do with "known duplicate folders" or something... Uh, hotlinked folders maybe? If that was so, it'd be stupid-crazy. Maybe, instead, it's if you want to keep a backup of a folder then Micro$oft considers that a bad thing or something, so they have an operation to find and destroy those? Or, at least to bludgeon them with a hammer and leave them for dead in an alley or something?