Why does this community need '@lemmy.ml' even locally?

Going to https://lemmy.ml/c/usmlr gives a 404, but https://lemmy.ml/c/usmlr@lemmy.ml works.

There's also quite a bit of lag in federation, with most other instances not even having the last changes I made to the description. Only lemmy.world does, but I also moderated and post in the community from that instance, so that may be why.

• https://lemmy.world/c/usmlr@lemmy.ml/data_type/Post/sort/New/page/1
• https://beehaw.org/c/usmlr@lemmy.ml/data_type/Post/sort/New/page/1
• https://lemmy.one/c/usmlr@lemmy.ml/data_type/Post/sort/New/page/1
• https://sh.itjust.works/c/usmlr@lemmy.ml
• https://kbin.social/m/usmlr@lemmy.ml/newest

I would assume beehaw simply won't receive the posts I make from my lemmy.world account, because defederation.