Pale Garden Biome is not available for World Type: Single Biome

In the World Customization when selecting a biome for the World Type: Single Biome, the Pale Garden is missing as an option for world generation.

 

To reproduce:

• Launch Minecraft snapshot 24w40a
• Create New World
• Go to Experiments and turn on Winter Drop, click Done
• Go to World -> World Type: Single Biome
• Go to Customize and scroll to where the Pale Garden should be located above Plains
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