The Bug:
Sculk sensors are not activated upon shulkers shooting
Steps to Reproduce:
Make a shulker shoot you.
→ ❌ Notice how when it does so, the sculk sensor does not activate.
Additional Information:
Quote from the 20w49a Changelog, "A vibration is anything that causes physical motion". I would definitely consider this as physical motion, as a shulker is physically shooting.
Avoma
Can confirm