The Bug:
Red and brown mushrooms can visually float on top of walls that have the “up” block state set to false.
Torches, cactus flowers, pressure plates, signs, and banners make a wall raise its post when placed on top of it, so they sit on the wall. As of recently, red and brown mushrooms can be placed on top of walls, but the wall itself won’t become a post, making the the mushroom float above it. This can be fixed by adding red and brown mushrooms to the wall_post_override block tag.
Steps to Reproduce:
Place down three cobblestone walls in a straight line.
Place a red or brown mushroom on top of the middle wall.
Observe if the mushroom floats above the wall.
Observed Behavior:
Red and brown mushrooms placed on top of walls float above them.
Expected Behavior:
The wall would raise its post when a red or brown mushroom is placed on top of it.