After firmware update to 6.9.0 my backup software can't work properly over SMB

Hey, looks like latest firmware update somehow broken my backup pipeline.

I'm using Veeam Endpoint to make automatic everyday backups to the NAS over SMB.

But after firmware update it can't work properly due to this error:

Error: Incorrect function. Agent failed to process method {ReFs.SetFileIntegrity}.

I've submitted a support case to the Veeam Support as well, but this firmware update is an only one change I to my NAS and PC before this error started to appear.

Any thoughts on this issue?