Mobs from spawn eggs have getEntitySpawnReason() of NATURAL

### Expected behavior

It should have a spawn reason that is not natural

### Observed/Actual behavior

It has a spawn reason of natural

### Steps/models to reproduce

Spawn any mob i.e polar bear with spawn egg, query spawn reason, its set to Paper.spawnReason: NATURAL

### Plugin and Datapack List

N/A

### Paper version

92ed3f00b13692d349ba09d6ab34794ca46b37fa

### Other

_No response_