Warning SPOILERS. For my question see below.
Ok, i've played a number of hours and i'm in the architect's tomb where you have to open the three doors to actually enter the room. I step on the last switch, quickly make my way across the ravine with the razorblades and the platforms, but when i get to the entry to the tomb i hit an invisible wall (all the doors are open). I just can't enter the room and after a few secs the door closes. What am i supposed to do? Is this a confirmed bug and, if possible, how do i work around it?