Spawn In Fully Landlocked Mushroom Biome Surrounded By Normal Biomes (because it's more common to see it surrounded by rare biomes on this sub now)
Original author: BigBrain5Head
Link: https://reddit.com//r/minecraftseeds/comments/l3wdqo/spawn_in_fully_landlocked_mushroom_biome
Comment: Java 1.16 to 1.17 snapshot
Seed: 5293651824432564782
Located at spawn, the mushroom biome is surrounded by plains, forest, and taiga. The water does not enter the ocean so it is landlocked.