entities with spawning items (such as armor stands) can no longer inherit NBT tags from the item, and instead use the "entity_data" component to specify NBT data explicitly. Thrown items, however, such as eggs and snowballs, do not benefit from this. 

To confirm that armor stands etc use "entity_data" as intended: 
1. /give @s armor_stand[entity_data=\{id:armor_stand,NoBasePlate:1b}]
2. place the armor stand in the world.
3. Note that the NoBasePlate tag has properly applied.

To confirm that certain NBT tags, such as the "Item" tag, work with thrown projectiles:

1. /summon egg ~ ~ ~ {Item:{id:diamond_sword,count:1}}
2. Note that the Item tag has been properly applied.

steps to reproduce:
1. give the player a snowball/egg with the "entity_data" tag, i.e:
      /give @p egg[entity_data=\{id:egg,Item:{id:diamond_sword,count:1}}]
2. use/throw the item. 
3. note that the Item tag has NOT properly applied.