mojira.dev
MC-167143

Biomes converting into other biomes when upgrading from old versions

Resolved
Cannot Reproduce
5

I just created a world in 1.0.0 and all previously generated biomes converted into other biomes, for example, a swamp converted into snowy tundra or desert converted to forest.

Relates to MC-31205

I didn't test yet but I think it will 99.98% certainly happen if I convert an old world from the first version that had prooper biomes - alpha v1.2.0.

Linked issues

is duplicated by 2

relates to 2

Attachments

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Comments 6

Does this happen when you convert the world from 1.0.0 to 1.14.4 as well? Or only in 1.15?

Yes, it does. Adding 1.14.4 to ''Affects Versions''.

Hi!
I can confirm.

Can confirm. This is due to the new biome systems along the versions.

Can confirm in 1.17.1.

Direct conversion from pre-1.2 to 1.18+ is no longer possible, so this is no longer reproducible. The only possible upgrade path is via a pre-1.18 version, which will be affected by this bug and therefore corrupt the world.

W_V

(Unassigned)

Community Consensus

Datafixer

1.14.4, 1.15 Pre-release 5, 1.15 Pre-release 6, 1.15, 1.15.1, , 1.16.3 Release Candidate 1, 1.16.3, 1.16.4, 20w51a, 1.17.1

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