If I put {Silent:1} on the Wither Boss,
it does no sound on death and hurt,
but they will still make sounds when shooting wither skulls.
As NoAI:1 no longer makes the boss health bar
to move, I wish to have a solution for that.
Although I use /kill @e[type=WitherSkull], it stll makes sound.
Duplicate of MC-64242 (the silent tag also does not work on several other sound events).