If u wanna spawn in Mushroom Biom try this seed: -1105615928
The Seed "-1105615928" will produce the Mushroom Island with connected forest at spawn in all Releases of minecraft from 1.7.2 through 1.13.2.
EDIT: I just created this world in 1.14. It's the same. The Mushroom island biome has a very large ravine system.
Here are the Amidst maps for it in 1.12.2 and 1.13.2
There are no dangerous weapons. There are only dangerous people. R.A. Heinlein
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If you have questions about the maps I post as attachments or Amidst and the like read this thread:
Using Amidst type programs to map and research Seeds
The latest release of Amidst, version 4.3 can be found here:
You should probably also read this:
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I created world at modded 1.12.2 and i spawn there, then i try 1.8.8 and when i get same result u post it here