Kelp spawns on trapdoors, stairs, slabs and chests on sunken ships

The bug

Found some kelp that spawned on the trapdoor on a sunken ship. The issue is when you open the trapdoor it stays floating in the water above it.

How to reproduce

Seed: -8300275442758179407
Coordinates: /tp -407 50 2254 (for stairs and trapdoors)
Coordinates: /tp 514 56 1536 (for chest and slabs)