Alright! I've managed to fix the issue. It appears that the extension "DuckDuckGo Privacy Essentials" caused embedded twitter posts to not appear. Maybe @VicSage has a similiar issue?
Ok, I tried two seperate browsers, and it appears you see correct. In the duckduckgo- and the edge-browser, these twitter posts appear with no issue. Now I gotta figure out which of my apps is causing the problem. Joy...
When someone posts a post with an embedded tweet, I see "Tweet Loading" for a split-second, and then this:
I'm not sure if my Blocker is responsible, as I've no idea why it would do this:
Any idea how to fix it?