A Microsoft file hosting and synchronization service.
imo MS anyway does something to solve this problem not as usual, anyway it's good for customers.
Me and two of my shared accounts who had been sharing folders with me, all solved.
I did not do anything, it was automatically solved.
But some accounts I have the same problem still now.
I think they do something step by step, account by account.
So you may need to wait a few days / weeks so that this would be solved soon.
Now: for solved shared folders from a part of accounts, Accessible via win11 F Explorer & move/copy/paste is available to/from shared folder to my folder/root.
hope this helps.