Thanks for the detailed information, and the website looks absolutely wonderful so far! I’m happy to help resolve this for you.
In the CodePen example, I noticed a small syntax error that CodePen automatically corrects and displays:
Would you be able to check the syntax in your problematic Embed Elements and republish? If you could list the pages with the specifically problematic Embeds, that would also be very helpful! If the syntax shown above and below isn’t the cause, I’m willing to help further.
Here’s an example: