Stairs have an odd lighting quirk due to their multiple-cuboid model

At night or in a dark room, if you look at the back side of stairs when there is a light source behind the stairs, there is a lighting quirk that occurs - most likely due to the multiple cuboids in the stairs model. Note that this issue only seems to occur with smooth lighting enabled.

This bug was previously mentioned in MCPE-8054, but since that ticket had become bloated with a total of 3 technically separate bugs (2 of which had been fixed), the remaining bug (this one) was reported separately and MCPE-8054 was resolved as fixed.

Steps to Reproduce:

1. Set your brightness to 0 and enable smooth lighting.
2. Go into a dark room or set the time to night.
3. Place down stairs. (quartz is the best for seeing the bug)
4. Place a torch in front of the stairs. (the side with the steps)
5. View the stairs from the flat back side.