So, I wanted to spawn in a Mushroom Biome using the seed picker when creating a new world on Minecraft version before the Caves and Cliffs Update. It worked.. But when I tried to spawn in a Mushroom Biome using the seed picker in Minecraft version 1.18+, it doesn't spawn me there anymore. It just spawns me in a random Jungle Forest.

How to reproduce this (In old Minecraft Bedrock versions):
1. Open up Minecraft (Whether it be Beta or full release)
2. Press "Create new world"
3. Scroll down to find "Seed Picker"
4. Find "Mushroom Biome" and set that as the new world's seed
5. Wait for the world to load

How to reproduce this (In the new Minecraft Bedrock version 1.18+):

• Same thing applied here from the top reproduction steps.

What's supposed to happen:
A: You'd spawn in a Mushroom Biome as shown in the preview image of the Seed Picker.

What happened instead:
A: It just spawns you in a random Jungle Forest in the middle of nowhere instead.