This link returns nothing: https://programming.dev/search/q/https%3A%2F%2Flemmyrs.org%2Fc%2Flemmyfederation%40lemmy.ml/type/All/sort/TopAll/listing_type/All/community_id/0/creator_id/0/page/1
Related to GItHub issue: https://github.com/LemmyNet/lemmy/issues/3203
Actually the communities show up in the search results, but only after some time (10-20 seconds). At least for me.