The Bug:
Sculk sensors are not activated upon extinguishing a candle.
Steps to Reproduce:
Extinguish a candle.
→ ❌ Notice how the sculk sensor does not activate upon doing this.
Additional Information:
Quote from the 20w49a Changelog, "A vibration is anything that causes physical motion". I would definitely consider this as physical motion, as you are physically performing this task.
Can confirm.