Disguised entities do not play the death sequence properly

[James103]

To reproduce:

1. Starting with Minecraft 1.16.5, install Fabric loader and Fabric API.
2. Install mobdisguises-1.0.0-fabric and disguiselib-1.0.2-fabric.
3. Create a new world with cheats enabled.
4. /summon zombie ~ ~ ~ {CustomName: '""', DisguiseLib: {DisguiseType: "minecraft:player", DisguiseAlive: 1b}, UUID: [I;-873554585,-1697035970,-1367762496,1015370517]} (summons a Zombie disguised as a player)
5. /summon zombie (summons an undisguised Zombie)
6. Kill the undisguised Zombie, which should die and use the regular death sequence.
7. Kill the disguised Zombie. Any of the following may occur:
   • The disguised Zombie stays in place until the entity disappears at the end of the death sequence.
   • The disguised Zombie plays the death sequence, but gets stuck on the first frame.
   • The disguised Zombie plays the death sequence normally (expected result)