Warden spawns in peaceful mode

Steps to reproduce : 

1. Start any world in peaceful mode
2. Find a Sculk Shrieker
3. Walk around the Shrieker until it has triggered three times.

The Warden will appear and walk to the players location. After this, the Warden will stand still screaming at the player. If the player moves, the Warden will not follow.

(This is my first bug report. I'm 9 years old. Hope it's okay)