The bug
When launching a firework (by placing it in the world), sculk sensors are not activated. They only activate when the firework explodes.
Linked issues
is duplicated by 1
Comments 3
Looking at the changelog, fireworks being launched is not filed as a "vibration" but a firework explosion is because it's an explosion (pretty self explanatory). However, fireworks are technically projectiles, so their launching should be filed under "projectile fired".
Can confirm