Noticed this back when housing was released but just thought it was the same for all houses.
To get as close to the wall ( past tht invisible barrier ) u gotta jiggle the furniture left and right along the barrier and make ur character walk towards the wall to kinda wedge it in.
But once ur in and u move the furniture before confirming the new destination the symbol will go from orange to purple even tho u were in the same spot after the slight movement.