I noticed this bug myself, and I'm sure the majority of you have too. In case you don't know what I'm talking about, watch the video below (the guy talks about the bug straight away so you don't have to watch all 10 minutes of the clip).
Yes, a big purpose of releasing a demo is to allow players to discover flaws such as these, so Konami can work on a patch before the official release date arrives. It's a problem that's still frustrating me whilst I play the demo.
But it appears that the bug has been fixed. Jon Murphy was asked about the situation on his Twitter. He stated that the team were aware of the situation, who have since implemented changes and the problem seems to have disappeared in the new code.
Happy days... If the problem has genuinely been fixed...
Note: Apologies for the desperately uncreative title.