>>1834329
I think downgrading with an older version of Archipelago might work. I was able to generate this Archipelago since I still had the Minecraft APWorld installed. If it wasn't supported, I wouldn't be able to generate it. That's my only guess.
Not everyone has go be on the same Archipelago version. Or else the others wouldn't of been able to even connect before I linked the beta branch in the thread.
I assume it's just not *officially* supported right now. But there's nothing stopping you from finding the apw online or in the old Minecraft github.