Closely relates to MC-249097.

The bug

Despite the four horizontal side faces of sculk shriekers being flush with the sides of blocks, a solid full block placed next to a sculk shrieker will not cull that block face, causing it to be rendered for no reason. This is not the case in Java Edition,resulting in a parity issue.

How to reproduce

1. Place a sculk shrieker
2. Place a solid block next to it
3. Enter Spectator mode
4. Clip into the solid block

Expected results

You wouldn't be able to see the bottom half of the sculk shrieker's side from within the block.

Actual results

You can.