Hello! Was hoping to make discuss.online my new home instance, but I'm having trouble accessing some communities on other instances:

• !artisans@reddthat.com
• !mapmaking@lemmy.world
• !rpgcreation@ttrpg.network
• !rpgdesign@lemm.ee

They don't show up in communities search, and trying to go to them directly returns a server error page, with an error message given like:

FetchError: invalid json response body at http://lemmy:8536/api/v3/post/list?community_name=rpgcreation%40ttrpg.network&page=1&limit=20&sort=Active&type_=All

I can access other communities on all of those instances...

• !games@lemmy.world
• !abandonedporn@reddthat.com
• !rpgmemes@ttrpg.network
• !whatcouldgowrong@lemm.ee

... so I know it's not an issue with them being blocked, but it seems like they're not being fully federated either?

Anything I can do on my end to further investigate or attempt a workaround?