Mushroom archipelago off spawn! [1.21.9+]

Messing around on chunkbase randomly generating seeds and came across this one. Spawn on a small desert island in a bay, <1000 blocks Northwest of the mushroom archipelago. Never seen a seed like this before! Archipelago stretches across 6 island clusters spanning from ~X:-800, Z:2000 to ~X:3000, Z:-1000 (~5000 blocks total!).