Clone of MC-250188 but that got incorrectly resolved as Duplicate as it portrayed the issue as specific to targeting Ender Dragons

If a Warden is about to hit any target with sonic boom but that target somehow vanishes, then the warden will continue the animation but behave completely as if it stopped attacking. It won't make the sonic boom booming sound, it won't make any particles and it will start wandering around and sniffing during it's sonic charge animation.

Video: https://youtu.be/cSJPXBOYPHY