The post formatter is putting the "@user" concept at too high a priority. It screws up Mastodon links, and also adds an extra space for no reason I can tell. Edit: Even on this line, the "@user" placeholder has an extra space in front of it that I didn't type.

Here's a link to one of your posts, just pasted as plaintext, to use as an example of how garbled it can get:

https://mastodon.social/@zep/109507080931110623

Here it is as an inline code blurb https://mastodon.social/@zep/109507080931110623.

Here it is inside a code block:

https://mastodon.social/@zep/109507080931110623

This is what I actually typed, as an image: