Which browser/version are you using, and could you share one widget snippet that no longer converts when pasted? That would help narrow down the change.
All my widgets are broken, so you can try out this one:
<iframe frameborder="0" src="/embed/1803313" width="552" height="167"><a href="https://ludonauta.itch.io/milkywaymail">Milkyway Mailing Inc. by Ludonauta</a></iframe>
