"No selected features in backup" error with only "Contents of server's MySQL databases" selected

Virtualmin gives "No selected features in backup" error message when only "Contents of server's MySQL databases" is selected. I have to select some other options to get it pass through this step, but sometimes I need to restore nothing else, but only the MySQL database for the virtual server.

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Are you seeing this error when backing up, or when restoring?

That means that the backup doesn't contain any MySQL databases. Did the backup include all features?

Backup in fact had MySQL database, which I have extracted from .backup subdirectory of the backup image. Please just try to extract the database dis-selecting everything else and you will see the same error.

When you made the backup, which format did you select?