If you throw eggs to spawn a chicken, the chicken survives 2 hits with an iron sword, chickens from a spawn egg only one.
Chicken health is greater from eggs
If a chicken spawns by a chicken-laid egg, it has 5 hearts instead of 2.
Level of health varies according to their spawn chickens.
Spawning chicken with an regular egg, chickens will have 10 health
Chickens spawned from a thrown egg have 5 hearts of health.
Chickens have incorrect health from eggs
Incorrect amount of hits for chickens from eggs
Egg spawns chicken with incorrect health
Mobs dont spawn with full health