As a matter of fact it wasn't a bug, it was intended to be that way to make that part harder. The thing is that so many players got frustrated (Specially when they were playing on Laptops) and gave up on the second play through (or even on the first one) not being able to achieve the second ending or in the worst case no endings at all.
So after giving it a little bit of a thought... Ive decided to make that part easier so the players don't get so easily frustrated and they could be able to unveil most of this version's secrets.