Sculk sensors do not detect when withers shoot wither skulls

The bug

When a wither shoots a wither skull, sculk sensors do not react, despite this being a projectile fired. According to the 20w49a changelog, this is a valid vibration.

How to reproduce

1. Build a bedrock box to contain the wither, in case something goes wrong:

   /fill ~ ~ ~ ~15 ~10 ~15 minecraft:bedrock hollow

2. Go inside of the bedrock box, and summon a wither riding a minecart:

   /summon minecraft:minecart ~ ~ ~ {Passengers:[{id:"minecraft:wither"}]}

3. Place a sculk sensor next to the wither

4. Use a spawn egg to summon a chicken on the opposite side of the bedrock box

5. Wait until the wither attacks the chicken by shooting wither skulls
   ❌ Notice how the sculk sensor is not activated when the wither shoots its skulls