Transition between Biomes from 1.17.41 to 1.18 leaving hard edges between chunks / Biomes.
Steps to recreate.
Update an Xbox one bedrock survival world from 1.17.41 to 1.18.
Render new chunks.
Observe harsh transition and lack of blending between old and new world's.
Old chunks will transition smoothly into new chunks.
Transition between old and new chunks is obvious and not blended properly.
This does not affect gameplay.