A Microsoft file hosting and synchronization service.
Hello, Blanchi
Thank you for raising your concerns in the Microsoft Community.
We are aware of the problem and are working to solve it. The URL files will automatically be converted back to folders when the issue is resolved. For now, we recommend accessing shared folders that are in this state in OneDrive.com.
Please see this information here:
Add and sync shared folders to OneDrive for home - Microsoft Support
Best regards,
Mia | Microsoft Community Support Specialist