It's an issue that will be fixed in the next update (which is gonna be released pretty soon)
Correct me if I'm wrong but it's my understanding that defederation is in fact bidirectional. lemmy.world can't see new posts from beehaw after the announcement.
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The creator of the list is not adding unofficial communities in the index, so there might be the communities you're looking for on Lemmy already.
If not, it's still very early days so give it time each day many more communities are being created.
Each instance will have different perspective on it. Some would obviously censor more stuff than us. It will depend on the user what kind of experience he is looking for.
Just Uncheck this. (in your settings)
I can view those communities just fine, can you elaborate where the issue is ?
I've been thinking of collecting index/list type sites for lemmy and unsure whether to append them here or make a seperate post for them