The line that shows the links to other crossposts should add a (#comments), if there is any, after each link.
Some links get crossposted to multiple communities but I don’t know if any of these posts have any comments and it’s tedious to check them out one by one, and in my experience most of them don’t have any comments which discourages me from checking them out.
Also crosspost links could be in order of comments.
Another idea: instead of (#comments) it could be a different color or some other indicator.
Looks similar to the new UI in the PR linked above, except you have to expand it manually.
Having to expand it manually would help make the page look less cluttered. What I’m suggesting is that you have the Crossposts section at the bottom beneath the comments and for the user to be able to expand crossposts and read their post text and comments, essentially combining the crossposts display with the idea of fetching and showing comments from crossposts together.