A shulker box falling block entity is invisible. While it should not be invisible.

How to recreate:

*/summon minecraft:falling_block ~ ~3 ~ {BlockState:

{Name:"minecraft:cyan_shulker_box"}

,Time:1}*

This will make an invisible falling block that will appear when it hits the ground.

This probably has to do with the fact that a shulker box is a block entity as non-block entities are not invisible:

*/summon minecraft:falling_block ~ ~3 ~ {BlockState:

{Name:"minecraft:stone"}

,Time:1}*