rss feed problems on special url

On 3.0.6 rc3 i found thid bug/lack of features.

When you link to a post like this, the url in url bar doesnt work correct.
http://phpbb3bbcodes.com/viewtopic.php?f=36&p=3993#p31422

But if the link looks like this. The topic shows up in rss perfect.
http://phpbb3bbcodes.com/viewtopic.php?f=53&t=811&start=0

Its seems strange its posible to link to a post inside a topic without mentioning the "t" in url.