Green hostile entity approaches player and explodes

Description

A green, four-legged hostile mob will silently approach the player and, upon reaching a close range, initiate a fuse sequence and explode, dealing damage and destroying terrain. This behavior is consistent and reproducible.

How to Reproduce

1. Launch Minecraft in any game mode.

2. Wait until night or enter a dark cave.

3. Find a green, four-legged hostile mob.

4. Stand within approximately 3 blocks of the mob.

5. Observe the mob's behavior.

Observed Result

The green mob reliably initiates a fuse sequence (flashing white and hissing) and explodes after a short delay, damaging the player and the environment.

Expected Result

This entity should not exist in the game in the first place.