I have noticed a number of communities listed on https://browse.feddit.de/ are not findable via the community browser here. Is there a batch job that updates the community list? If so how often does it run?
I've found that if they don't show up in search, you can go directly to the url and subscribe there. After that it will actually show up in search here.
This has been a bit hit and miss for me though. I'm pretty sure it's supposed to work, but sometimes you'll get a 404. My guess is that it's because the initial request the perthchat instance makes to lemmy.ml might pull down a lot of data, and if lemmy.ml is under load it might drop the request.