Seed generates a lone mushroom island, great choose for ocean survival. Hostile mobs will not spawn here, but you will have some problems with wood. You can get it on shipwrecks that can be found around, or on a small island with a pillager outpost at coordinates 650 ~ -170. The nearest continent is quite far away, and it making survival realy hardcore.
How to use Lone Mushroom Island seed
Start the Singleplayer mode
Select ‘Create New World’
Then click on ‘More World Options…’
In the ‘Seed for the World generation’ field, enter 6305247179760345244