Well you are free to disagree if you wish, but I've looked at the code to see what it does .......
I know... One more: As the postbit is the only place where this "phenomenon" of the unwanted guest status persists until the fix I am wondering where the <if condition="$show['profile']"> is set. I guess that would be a good place to check since the username and title in the posbit_legacy is the only visible place changing it?s appearance when the fix is executed. My posbit_legacy regarding this looks like: