The Ender Dragon Spawn Egg has the "Disabled in Peaceful" note despite being able to spawn in Peaceful mode

The Ender Dragon was previously able to spawn regardless of the world difficulty, hence the phrasing of the summary.

Steps to reproduce

1. Open a world

2. Set it to Peaceful mode

3. Grab an Ender Dragon Spawn Egg

4. Notice how the item description says “Disabled in Peaceful”

5. Use the Spawn Egg on the ground

6. Notice how it still spawns an Ender Dragon

Related to MC-300057.