Here's the Amidst map of "3849146039399739925" for MC 1.15.2.
It is unusual to spawn on a Mushroom Island.
Spawning on an island that is 100% Mushroom Island biome causes serious survival problems.
This one is no exception.
I created this world and ended up on an island with NO trees and no trees visible anywhere.
Since I always create worlds in Creative mode (then switch to Survival if I decide to actually play the world) I could have given myself some wood and/or tools to give myself the ability to continue playing.
I then created the world a second time but with a bonus chest..
I spawned on the Mushroom Island but the bonus chest was floating out in the ocean.
Getting the contents of the chest was an interesting problem.
YMMV - but my chest contained:
1 wood pickaxe
1 wood axe
1 apple
1 loaf of bread
1 Raw Salmon
4 Jungle Logs
5 Oak Planks
That gave me a total of 21 wood planks.
4 were used to make a Crafting table
5 Jungle wood planks were used to make a boat.
Below is my inventory after making the boat.
I found a cave, got some cobblestone, made a stone pickaxe, and mined some coal.
Then made 8 torches and mined 11 iron ore and more coal.
The third image is what I had when I left the island.
I decided to go north from the north end of the island to try to get to the village on the mainland.
I made it to the mainland without any problems and found the village.
There are no dangerous weapons. There are only dangerous people. R.A. Heinlein
If you aren't part of the solution, then you obviously weren't properly dissolved.
While quite rare, I have stumbled a number of times on such seeds which start in the mushroom biome (and usually an island). I skip them now, exactly because of the problem of getting started from there. One ends up having to leave it pretty much immediately anyway, to fetch at least some more wood, so a better start is to start on a medium sized forest/mix island, with a mushroom island within visual distance. Get some wood, some saplings, some wheat seeds, and swim/boat to mushroom biome area before night...
I made my first start (after years of non-playing) on such world with a nice forest island + mushroom island in sight -combo, but I then moved on to look for even better later play for the next world. Found one with a large mushroom biome (not island) which had a village mostly on the mushroom biome side. I later realized even that wasn't quite the thing I want, even if it is quite the peaceful thing..
Anyway, if someone does look for a start right on the mushroom biome, then for options, here is the only seed I have written down: 776131508083013976
It is not fully an island, because the savanna to south is separated by just a river. (Another mushroom biome is quite near to north-west.) Nothing wondrous in the nearby area otherwise, imho.
Try this seed in minecraft JAVA edition for a cool, large, mooshroom biome!
3849146039399739925
Here's the Amidst map of "3849146039399739925" for MC 1.15.2.
It is unusual to spawn on a Mushroom Island.
Spawning on an island that is 100% Mushroom Island biome causes serious survival problems.
This one is no exception.
I created this world and ended up on an island with NO trees and no trees visible anywhere.
Since I always create worlds in Creative mode (then switch to Survival if I decide to actually play the world) I could have given myself some wood and/or tools to give myself the ability to continue playing.
I then created the world a second time but with a bonus chest..
I spawned on the Mushroom Island but the bonus chest was floating out in the ocean.
Getting the contents of the chest was an interesting problem.
YMMV - but my chest contained:
1 wood pickaxe
1 wood axe
1 apple
1 loaf of bread
1 Raw Salmon
4 Jungle Logs
5 Oak Planks
That gave me a total of 21 wood planks.
4 were used to make a Crafting table
5 Jungle wood planks were used to make a boat.
Below is my inventory after making the boat.
I found a cave, got some cobblestone, made a stone pickaxe, and mined some coal.
Then made 8 torches and mined 11 iron ore and more coal.
The third image is what I had when I left the island.
I decided to go north from the north end of the island to try to get to the village on the mainland.
I made it to the mainland without any problems and found the village.
There are no dangerous weapons. There are only dangerous people. R.A. Heinlein
If you aren't part of the solution, then you obviously weren't properly dissolved.
The latest release of Amidst, version 4.6 can be found here:
https://github.com/toolbox4minecraft/amidst/releases
You should probably also read this:
https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-tools/2970854-amidst-map-explorer-for-minecraft-1-14
You can find me on the Minecraft Forums Discord server.
https://discord.gg/wGrQNKX
While quite rare, I have stumbled a number of times on such seeds which start in the mushroom biome (and usually an island). I skip them now, exactly because of the problem of getting started from there. One ends up having to leave it pretty much immediately anyway, to fetch at least some more wood, so a better start is to start on a medium sized forest/mix island, with a mushroom island within visual distance. Get some wood, some saplings, some wheat seeds, and swim/boat to mushroom biome area before night...
I made my first start (after years of non-playing) on such world with a nice forest island + mushroom island in sight -combo, but I then moved on to look for even better later play for the next world. Found one with a large mushroom biome (not island) which had a village mostly on the mushroom biome side. I later realized even that wasn't quite the thing I want, even if it is quite the peaceful thing..
Anyway, if someone does look for a start right on the mushroom biome, then for options, here is the only seed I have written down: 776131508083013976
It is not fully an island, because the savanna to south is separated by just a river. (Another mushroom biome is quite near to north-west.) Nothing wondrous in the nearby area otherwise, imho.