Thanks Rafael, good to know that the direct embeds work.
We’ve always used the second link structure:
To show that it used to work, here’s a a post on one of our private sites which uses that link structure and still has the embed: https://pod8.akimbo.com/t/about-the-2-the-magical-power-of-starting-small/17
If you look at the raw markdown for that post, you’ll see the embed uses the link structure I referenced. I’m guessing that if I edited the post now, the embed would disappear.