[Bug]: 3.15.81 displays syncing issue, in settings shows sync location is a drive and doesn't support virtual files

[VinnieNZ]

⚠️ Before submitting, please verify the following: ⚠️

• This is a bug, not a question or a configuration issue.
• This issue is not already reported on Github (I've searched it).
• Nextcloud Server and Desktop Client are up to date. See Server Maintenance and Release Schedule and Desktop Releases for supported versions.
• I agree to follow Nextcloud's Code of Conduct

Bug description

After updating to 3.15.81 beta, the notification area shows a red X for Nextcloud sync. Clicking on this shows some files can't be sync'd, but there is no evidence of this below the error:

Going into settings, there is an error which states "Please choose a different location. C:/Nextcloud/ is a drive. It doesn't support virtual files":

On this machine, C:\Nextcloud is definitely not a drive - it is a folder/directory:

Steps to reproduce

Install 3.15.81 beta and note the sync error.

Expected behavior

No sync error and no alert to say a folder is a drive.

Which files are affected by this bug

N/A

Operating system

Windows

Which version of the operating system you are running.

Windows 11

Package

Official Windows MSI

Nextcloud Server version

28.0.7.4

Nextcloud Desktop Client version

3.15.81

Is this bug present after an update or on a fresh install?

Updated from a minor version (ex. 3.4.2 to 3.4.4)

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

Are you using an external user-backend?

• Default internal user-backend
• LDAP/ Active Directory
• SSO - SAML
• Other

Nextcloud Server logs

Additional info

No response

[nilsding]

thanks for reporting!

will be closed by #7877