Since this topic was auto-bumped today, I figured I’d give this a try. Testing this URL with the latest Chrome browser on Ubuntu:
https://meta.discourse.org//t/posts-with-embedded-polls-fail-to-load/135549/9
The URL is now being rewritten to fix the double // and loading for me without any issues: https://meta.discourse.org//t/posts-with-embedded-polls-fail-to-load/135549/9