Grass blocks located two blocks below dark oak trees aren't converted into dirt when the world generates

The Bug:

Grass blocks located two blocks below dark oak trees aren't converted into dirt when the world generates.

Steps to Reproduce:

• Generate a world with the following seed and teleport to the following coordinates.
• Version: 1.19

  Seed: -7904429713016255202
  Coordinates: /execute in minecraft:overworld run tp @s 9586.03 69.20 -3265.92 146.81 10.88

• Take note as to whether or not grass blocks located two blocks below dark oak trees are converted into dirt when the world generates.

Observed Behavior:

Grass blocks located two blocks below dark oak trees aren't converted into dirt when the world generates.

Expected Behavior:

Grass blocks located two blocks below dark oak trees would be converted into dirt when the world generates.