Stairs cant slot on Platforms with platform trim

@DaenerysLovegood 

I tested this and it worked.  I did have a little trouble when trying to place the stairs on a corner tile (like you show in your pics), but I did eventually get it to place.  I suggest you try placing the stair one tile over from the corner then use the arrows on the stair to widen it to the corner tile and then again to narrow it back to 1 tile.

Hope this helps.