Saving the game while a mannequin is dying results in a warning being logged

To reproduce

1. /summon mannequin ~ ~ ~ {Health:1f}

2. Punch the mannequin

3. Pause the game while it is dying
   ❌ A warning has been logged

Original description & alternative reproduction steps

/tick freeze
/tp @s ~-2000 ~ ~
/summon mannequin
/kill @n[type=mannequin]
/tp @s ~2000 ~ ~
/tick step 2

should generate something along the lines of

10:33:22.060 emy Server thread [emy] Serialization errors: chunk@[-125, 0]cvl['Mannequin'/227, l='ServerLevel[New World]', x=-1993.50, y=-60.00, z=7.50]: Failed to encode value 'DYING' to field 'pose': Invalid pose: dying

Not sure what the implication is, but until I force load the chunk or teleport there I keep getting the errors on every automatic save, which makes me wonder if maybe that implies that the server refuses to unload the chunk fully?