The Bug:

Broken aquifer walls/borders commonly generate underwater.

As a result of this issue occurring, blocks can be seen floating underwater in bizarre and unnatural ways.

Steps to Reproduce:

• Create a world with the following seed and teleport to the following coordinates.

• Version: 21w44a
  Seed: 8731922480704591603
  Coordinates: /execute in minecraft:overworld run tp @s -2063.53 17.64 -1105.30 -2370.76 43.97
  

• Take note as to whether or not broken aquifer walls/borders commonly generate underwater.

 Observed Behavior:

Broken aquifer walls/borders commonly generate underwater.

Expected Behavior:

Broken aquifer walls/borders would not generate underwater.