Fade to black PS 1 can't enter open room

Can not enter open room here:
In the Game Fade to black in the corridor where there are a light square and then two pairs of dark squares I walk over the light square to Open the door at the end of the floor then jump over the dark squares without touching them then I jump over the second two dark squares successfully, too and in time to still have the door opened which lies behind them at the other end of the corridor, but the door is open and I can not move on through this door to enter the room behind it. I can only step Back and then the door closes.
Is this normal or a Bug?