Summoning WitherSkull in a Direction does not render, and turns invisible...

Summoning WitherSkull in a Direction does not render, and turns invisible...

Go /summon WitherSkull ~ ~2 ~

{direction: [] }

or /summon WitherSkull ~ ~2 ~

{direction: [0.5,0.0,0.0] }

and the WitherSkull will only be visible for a Split second and then turns invisible...