Invisible Shulker is a white cube

If you spawn a Shulker and then give it Invisibility with a splash potion, the shell will dissapear and a white small cube hovering 3 pixels in the air is left. Sometimes, when the Shulker opens while it's invisible, the white small cube changes into the "face" of a Shulker and 2 seconds later when it's closed again it changes back.