When upgrading old worlds, the terrain blending has sharp snow borders on the windswept hills.
To reproduce:
1.Create a world in 1.17.1 with seed 3. (This seed has windswept hills near spawn.)
2.Load this world in 1.18-pre1 (or other version being tested).
3.Inspect the biome blending at the edges -> No snow on the windswept hills where the biome was blended.
Likely cause: snow turns to rain at a slightly higher elevation in these biomes.
Attachments
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Screenshot was taken with seed 3.
Does this still occur when upgrading from 1.17 to pre-4?

Affects pre-release 4 and pre-release 5.
Attached is a world save, "S3-1171.zip". This world shows the issue after upgrading near the coordinates -48 29 and -14 346.


Dupe of MC-241760