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MC-241216

Terrain blending of old worlds has sharp boundaries for snow on windswept hills

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.

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bdm68

Screenshot was taken with seed 3.

tryashtar

Does this still occur when upgrading from 1.17 to pre-4?

bdm68

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.

bdm68

The world save in this report is referenced in MC-242026 (structures in wrong biome) and MC-241592 (cut off trees) because it replicates issues in both of those reports.

The world save was generated using seed 3 in 1.17.1 and then saving the game without moving from the spawn location.

Moesh

Dupe of MC-241760

bdm68

(Unassigned)

Confirmed

Datafixer

1.18 Pre-release 1, 1.18 Pre-release 5

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