The mansion does not appear to be in a dark oak forest, but instead, a plains/savannah intersection.

seed: 3645654

coordinates: 10728 ~ 23747

What I expected to happen was...:

I thought the woodland mansion would spawn in a woodland.

What actually happened was...:

It did not. It spawned in other biomes instead.

Steps to Reproduce:
1. Use seed 3645654 to generate a world in 1.20.4.
2. Go to the above coordinates.