Title, description and id are now correctly fetched over ActivityPub. But the library we are using is a mess, and the code is extremely ugly. Also our database and logic needs a good number of changes to deal with federation (like we cant use simple numeric IDs).
For user-visible URLs, keep in mind that having plaintext names (so something like
https://lemmy.ml/c/community@communism.lemmy.ml) is good for both human readability and search engine optimization.