Well, you're not paying for the bug to be fixed, you're paying for the consultant time to assist you in downloading and installing the fix, and answering any questions you have about the fix, and perhaps verifying that the problem has indeed been fixed to your satisfaction. Perhaps you don't need any of that. I'd be surprised if your consultant would charge you for just providing an email link to the Hot Fix for download. Everything beyond that is likely to be billable. It's how they pay their rent!

Technically, this isn't a bug fix though - it's a change in behaviour.