Armor stands with Marker tag have hitbox

I noticed armor stands with the marker tag set to 1 still have a small hitbox and i thought they shouldn't have. You can see this by standing on a block and looking directly down. Then doing this command: "/summon ArmorStand ~ ~ ~ {Marker:1}". After that you can see that the hitbox of the block you were standing disappears witch means that you're looking at the entity.