Nested ifurlparams

I’m trying to use urlparams to compose a phrase. Here is a short example of what I’m trying to do. It seems I can’t nest [ifurlparams]

[ifurlparam param=”FirstName”]Hey, I know you, [urlparam param=”FirstName”/]!

[ifurlparam param=”Lastname”]Hey, I know your last name too, [urlparam param=”LastName”/]![/ifurlparam]

<span style=”font-size: inherit;”>[/ifurlparam]</span>

Am I doing something wrong? Is this a bug/feature?

Thanks