Zombie horses continuously spawn naturally at night without mods or commands

Summary: Zombie horses are spawning naturally during the night in a completely vanilla environment without any mods, custom code, or commands.

Observed Behavior:

• Zombie horses spawn naturally at night with high frequency, similar to common passive mobs like sheep or cows.

• When morning comes, the naturally spawned zombie horses burn in sunlight and die.

Expected Behavior:

• Zombie horses should not spawn naturally in normal survival gameplay. They are intended to be spawned only via commands or spawn eggs.

Steps to Reproduce:

1. Create/Load a vanilla world with no mods or cheats/commands enabled.

2. Wait for nighttime or set the time to night.

3. Observe zombie horses spawning naturally in the area.

4. Wait for daytime and observe them taking fire damage from sunlight.