When adding "runtime_identifier" to an entity that will act as a projectile, the entity will act as a projectile however their model will stay stationary. This also sometimes crashes the game.

Expected Behavior:

 - The model follows the projectile

Actual Behavior:

 - The model gets stuck where it spawns

Steps to reproduce:

1. Duplicate all arrow files and rename identifiers to something else

2. Add ' "runtime_identifer": "minecraft:arrow" ' to the entities behavior file in the description

3. Spawn entity and observe that the model stays stuck in the air

These throwing knives use ' "runtime_identifier": "minecraft:snowball" ', also doesn't work with arrows or eggs.