Ender dragon can make idle sounds during its death animation

The ender dragon can growl during its death animation (and while flying to the portal to die, although this may be intended).

To reproduce, run the following command at 0 ~ 0 in any dimension:

/summon ender_dragon ~ ~ ~ {DragonPhase:9}

I was unable to reproduce this bug by killing the dragon by setting its health to 0.

Here's a video of the bug. OBS ducked the audio pretty hard so I apologize for that.

Clones MC-224107 and MC-224188.