+138 million blocks mushroom island surrounding an island !

This LARGE BIOMES seed -4677062535259598568 has an island enclosed in this +138 million block mushroom ring, at -1536256 16848054, the center island is over 800 blocks long.

This is also the first island in a mushroom island for Large biomes ever, and I found it by hand looking at massive mushroom island results.

-4677062535259598568 -1536256 16848054 java and Bedrock LARGE BIOMES