Community name in the feed was shortened to "onion@piefed.world" when the actual community was "Offbeat News - Not The Onion@piefed.world" as correctly rendered when viewing the full post. Given the meaning of onion/not the onion, this can lead to confusion as to whether the post is satire or real news.

No, the actual community name is actually just "Onion". https://piefed.world/c/onion

So there's a descriptive name, an @ name, and a URL name, all of which show differently. When I click on your link to go to that community, it shows "!onion@piefed.world" in the community subheading, but the individual posts below drop the exclamation mark from the @ name. I can see the reasoning behind the three different variations of the name for different purposes, but the difference between the two @ names seems like a bug to me.