That feed is not /c/cat on lemmy.world, it seems.

I just logged out and logged back in with no change. I'll clear my cache to see if that helps and will update this post if successful.

Edit: Clearing the cache did not help. Must be a Lemmy API issue?

Edit 2: NSFW communities are not hidden in the faux community feed either. Thankfully, they are blurred, but not hidden. Posting a comment with a picture from what was supposed to be lemmy.world/c/world. (Did I use "faux" correctly? I rarely use that word, so hopefully the intent shows.)

Edit 3: Ok, weird. cat on lemmy.world is broken from my account on .ca, but other communities are not, like business on lemmy.world. lemmy on lemmy.ml is also broken. The issue is more random than I thought.