The shulker box top texture appears unusually dark, the interior textures don't show up at all. The shulker mob itself seems to render normal, it only affects shulker boxes.
Incorrect rendering in the shulker box
Shulker Boxes cull faces incorrectly
Shulker insides are not rendering
Shulker boxes bottom texture invisible when opening from above, and top texture when below
Shulker Boxes' backfaces are invisible
Empty inside the shulker box.
Skeleton and wither skeleton skull inside textures are invisible
Shulker boxes have z-fighting issues
Shulker box top is rendered too dark