Glowing Invisible Slimes outline the inner cube instead of outer cube

summoning a slime with invisibility and glowing causes the inside of the slime to glow and not the outer cube of the model

steps to reproduce:
summon slime ~ ~1 ~ {Glowing:1b,ActiveEffects:[

{Id:14,Amplifier:1,Duration:199980,ShowParticles:0b}

]}