I agree with the do nothing for now suggestion, but am pretty annoyed at the havock this has caused me.
I have two microsoft 365 family accounts, each with six users. 12 users in total. Four of the users are 'me', one user being the master user also logged in to my home computer, and the other three users from the second account for which I have shared the root OneDrive folder with my primary account. Not shortcuts. The actual folders. The result has been one aggregated 4TB of OneDrive storage synced to my local 4TB NVMe drive where I know the associated user hosting the root folder becasue I have appended an abbreviation for this to the end of the folder name. Awesome. Faultless for all the years since I started it, and very cost-effective. By using a third party backup product, files from this local 4TB have then automatically replicated to three NAS devices on my home network depending on what they are. This means my family can stream files locally without me putting the source at risk.
Impossible to achieve where folders become shortcuts - which is exactly what's happened during the night. I have woken up to find circa 2TB of files deleted from my computer and shortcuts in their place. Not only that, but the delta change has triggered the backup utility to delete them from the three NAS devices.
Thank heavens that one of my backups is purposely run manually run once a week as an actual backup, where I am in control. I still therefore have one precious local copy of all the deleted files. Without this, I'd be in for several days of download or messing around with file recovery software and never certain that I have retrieved everything. Instead I 'just' need to rethink my strategy and accept the need that it will include manual steps.