Hi,
I'm afraid I don't have an answer for your issue, but this appears to be a known issue for many with the latest Windows 10, version 2004 update, see here:
https://answers.microsoft.com/en-us/windows/forum/all/smb-sharing-not-working-after-windows-10-update/298f9988-ddd7-48dd-9924-a21541d98c05
For now I suggest you use the builtin Windows Feedback Hub app within Windows and provide feedback about this issue so that Microsoft can start working on this issue.
Send feedback to Microsoft with the Feedback Hub app
https://support.microsoft.com/en-us/help/4021566/windows-10-send-feedback-to-microsoft-with-feedback-hub-app
Hopefully the issue will be resolved soon!
Best regards,
Leon