The Bug
Currently, Sculk Shriekers are not obtainable with silk touch and this is working as intended from MC-249125. However with a silk touch hoe, it doesn't drop experience, unlike an unenchanted hoe, even though the Sculk Shrieker isn't dropped.

Reproduce

• Get two Sculk Shriekers.
• Get a Silk Touch enchanted hoe.
• Get an unenchanted hoe.
• Mine one Sculk Shrieker with the unenchanted hoe.
• Mine one Sculk Shrieker with the silk touch enchanted hoe.

Observed Result
With the silk touch hoe you get no experience.
With the normal hoe you get experience.

Expected Result
Both Sculk Shriekers should drop experience as both Sculk Shriekers don't get dropped.