Extra air blocks in the "full_corner_column" structure of trial chambers causing missing blocks in the "chamber_2" room

Bedrock Edition repost of MC-270536.

Extra air blocks in the "full_corner_column" structure of trial chambers causing missing blocks in the "chamber_2" room.

Seed: -347564870507832086
Coordinates: 155 -22 -512

Seed: 3521727207246953729
Coordinates: 721 -9 104

Seed: 4526726972194875773
Coordinates: 8355 -44 336

Steps to Reproduce:

1. Create a new world using the given seed.
2. Teleport to the given coordinates.

Observed Results:
In the powder snow case, the two powder snows near the trial spawner are missing. In the short wall case, the tuff and copper blocks of the short wall is partially missing.

Expected Results:
No blocks would be missing.