when you make a 3x3 room with stone brick stairs and a stone brick slab in the middle, apart of the corner stairs becomes brown
Environment
Corner Stairs facing up with a slab in the middle
when you make a 3x3 room with stone brick stairs and a stone brick slab in the middle, apart of the corner stairs becomes brown
Corner Stairs facing up with a slab in the middle
From your description, I believe you are referring to one of the most popular bugs - MC-92