Page regression: What is the best way to mark up an exclusive button group?

[palimondo]

Page URL:

https://lea.verou.me/blog/2022/07/button-group/

Did this page work in the previous website?

Yes

What issues do you see?

Broken embed(s)

Description of issues

Only first Twitter link to advise by @LeonieWatson is shown as link (embed isn’t working), but the following citations are simply missing – not even the links to Twitter are there.