There are a few mobs that continue to make sounds during their death animation.
Some of the mobs that I know of are the following,
-Blaze
/summon blaze ~ ~ ~ {Health:0f,DeathTime:-200s}
-Phantom
/summon phantom ~ ~ ~ {Health:0f,DeathTime:-200s}
-Parrot; when in the air
/summon parrot ~ ~ ~ {Health:0f,DeathTime:-200s}
-Warden
/summon warden ~ ~ ~ {Health:0,DeathTime:-200s}
You can replicate this by using one of the following commands listed above
-This may seem like a duplicate of MC-94956, but that is about once a mob sound starts playing, it doesn't immediately stop once the mob dies compared to this where the mob continues to make its ambient sounds during the death animation.
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Relates to MC-254291