The issue was that the site wasn't seeing those as images because of the extra stuff on the end. So it was treating those urls as non-image urls and embedding the url in an iframe the same as an article.
So those work better now.
I also want to do some research on discord urls and see how many of these parameters I can strip off like I do for youtube links.
I might add a checkbox to optionally re-upload to our image host.
Let me know if either of these are things you want to see so I can know how much to prioritize them.