In the Woodland Mansion generated structure, floor and wall blocks for the interior of the building are visible on the exterior wall of the structure.

What I expected to happen was...:
To not be able to see any of the interior birch flooring as part of the outside wall (especially as it appears to be single blocks, and not a band running around the building)

What actually happened was...:
Some blocks from the interior walling and flooring are replacing (or not being overwritten by) some of the exterior of the structure.

Steps to Reproduce:

1. Make a world (with generated structures setting turned on, and where "Roofed Forest" will generate)
2. Find a Woodland Mansion structure (e.g: "/locate" command)
3. Fly around the building - and note, between the second and third floors, that some of the birch flooring is visible from the exterior of the building.

Additional Notes:

• Related to: MC-107637?
  • Closest relative I could find when doing a search for this issue.
• I believe these are the same issue, but I can split the ticket if they're not:
  • May also see some Dark Oak logs poking through the walls (other than the pattern that rings the building)
  • May also see some Cobblestone stairs with incorrect facing that allows visibility into the structure

Examples:

1. Seed: 5596122738704322835
   • Large Biomes generator setting.
   • Birch planks:
     1. 22533, 83, -10983
     2. 22549, 83, -10999
   • Dark Oak Logs:
     1. 22527, 81, -10983
     2. 22551, 81, -10999
   • "Incorrectly Facing" Stairs:
     1. 22559, 80, -11014
     2. 22559, 83, -11014
   • All of these missing slices, and showing pieces appear to be on the southern face of the structure
   • All of the 'incorrectly facing' stairs appear to be against the south-east corner