Why can’t I follow communities from this instance

I recently attempted to follow communties on this instance from mastodon and they all say pending. Does anyone know why this is happening? Is it possibly related to the federation problems of 0.19?
I made a github issue but I’m not sure if the Devs will help or not since on one hand it’s not their software but on the other hand it seems like a federation issue. 🤷​

@div0 @db0