Structures can generate floating on the surface of water

The Bug:

Structures can generate floating on the surface of water.

Here are some examples:

Seed: -7979010454089259359
Coordinates: /execute in minecraft:overworld run tp @s 362.94 63.63 619.93 137.08 15.75

Seed: 1008272812876823719
Coordinates: /execute in minecraft:overworld run tp @s -2719.50 64.00 -2991.50 93.61 9.11
Coordinates: /execute in minecraft:overworld run tp @s -2979.50 64.00 -4799.70 -1.18 8.84
Coordinates: /execute in minecraft:overworld run tp @s -10719.50 49.16 -799.50 -51.56 10.04
Coordinates: /execute in minecraft:overworld run tp @s 1344.30 49.16 784.30 -269.33 4.85

Steps to Reproduce:

1. Generate a world with any of the seeds provided above and teleport to the given coordinates.
2. Look closely at the generation of the structure.
3. Take note as to whether or not structures can generate floating on the surface of water.

Observed Behavior:

Structures can generate floating on the surface of water.

Expected Behavior:

Structures would not be able to generate floating on the surface of water.