You know how EVERY Spawn Egg's registry name starts with "spawn"?
Well, everyone knows this. A fun fact is that you can get a spawn egg of any entity as long as it's a mob, so "spawn_donkey" would give you a Donkey, and "spawn_allay" would give you an Allay.

But did you know you could get a Spawn Egg with nothing to spawn? Just simply type "/give @s 'minecraft:spawn'" to give you an empty Spawn Egg. And what does it spawn? Nothing.

The item is a little buggy, as it shows (I think) "item.spawn.tile.name", instead of "Spawn".
Plus, the fact that it doesn't use any colors since the last time I saw it. I'm pretty sure it just uses gray and light gray.

The only bug here is the name. The egg is the easter egg.

^{P.S., I checked MCPE-165289, and it just uses the chicken spawn egg texture. My mistake}