I am aware there were 4 issues or so opened recently with this issue. I also saw the commit that was supposed to fix it. I still have the issue, with a video that is allowed to be embedded: https://oscarotero.com/embed3/demo/index.php?url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DseeEkWpFXnk
I'm still investigating more as to why this is happening, but opening issue already.
Test result:

Embed option in sharing:
