I believe it is now impossible for the world spawn to be on a Mushroom Fields or Mushroom Fields Shore biome. This may be because of the new terrain generation catagorising these biomes as an ocean type, as so moves the spawn point to the nearest "land" biome.
Linked issues
duplicates 1
Comments 2
Thank you for your report 🙂
We're tracking this issue in MC-241029, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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This report is invalid. Believing in something that may or may not exist in the game isn't a bug.