We have a snapshot server that was started at the beginning of the snapshot cycle for 1.20, and with this latest snapshot we cannot generate the new Cherry Biome when we updated. Even when starting a new server, with a fresh world, the biome will still not generate.
It is fine, however, to generate in singleplayer.
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Do note that experimental settings must be enabled on servers by modifying the server.properties to contain this line:
initial-enabled-packs=bundle,update_1_20,vanillaHowever, this line being missing is not the root cause of the issue, just a helpful note for those attempting to reproduce. The underlying cause is that worlds either updated from previous versions (i.e. 23w06a) with experimental settings enabled, or generated from a dedicated server with the aforementioned line in server.properties, will set the biome_source of the overworld generator in level.dat to "minecraft:overworld". In singleplayer 23w07a, creating a new world with experimental features enabled will instead set this value to "minecraft:overworld_update_1_20", which is the generator that allows the new Cherry Grove to generate.
I have also attatched images of two example level.dat files, as provided by the program NBTExplorer.
It was stated prior to the first snapshot that added experimental data packs' changelog, that updating would not be supported.
This is Won't Fix/Works As Intended, following that blog post.
It is not just for worlds that have been updated, though. Worlds generated with experimental settings enabled in the server.properties on a fresh 23w07a dedicated server fail to enable the new biomes.
A world created in a given snapshot with feature toggles enabled will have both the normal snapshot features, as well as the experimental features enabled by those toggles, but will not be upgradeable to future snapshots or releases.
https://www.minecraft.net/en-us/article/testing-new-minecraft-features/feature-toggles-java-edition
Updating between snapshots is still updating.
The issue is not just with updating old worlds, which I do understand is not officially supported. It is also an issue with dedicated servers, running 23w07a, the most recent snapshot version as of this comment, generating a completely new world with snapshot features enabled, fails to generate the new Cherry Grove biome.
Can confirm, cherry blossom biomes do not generate in new chunks of existing worlds.