While fiddling around I managed to make a floor disappear letting me go to an area I definitely was not supposed to be at during this point in the game. Haven't beaten the game and it might get patched sooner or later, or maybe it'll get fixed in a graphics driver patch, OR maybe it's just very specific to my setup. No idea. Repeated the process and it was very consistent, though at times it required some extra work like running outside and around the planter on the other side of the road and then back in.

Here's a video of the process: