When I was pitting the Warden against the Ender Dragon, I noticed that most of the time, the Warden's attempt to fire a sonic boom to attack the dragon fails, with only the ribcage opening and no sonic boom produced.

I noticed that this only happens in situations where the Warden's attack could fail, and only successfully fire the sonic boom when it touches the Ender Dragon's hitbox.

How to reproduce:

1. create super flat world
2. /summon ender_dragon
3. spawn a Warden in using a spawn egg
4. observe the Warden's attempts to fire its sonic booms at the Ender Dragon.