Was there no texture (as in you had an open view into space) or was there no collider where you could walk through the wall?
I'm sorry for such a late response. If I'm correct, when you leave the room with the gun and healing pod, going straight and on second intersection turn right and very next intersection "room" has it right around the corner to right. On left side of that same intersection there are overlapping walls (meshes) causing flickering or I think it is called "Z-fighting".