The shrieking sound of the sculk shrieker is not considered a "Blocks" source sound as the Java Edition does, instead, it's a "Friendly Creatures" source sound.
How to Reproduce
- Trigger/activate a sculk shrieker
- Adjust the Blocks sound to 0
--> Clicking/step sound still persists.
- Adjust the Friendly Creatures sound to 0
--> No clicking/step sound.