[https://example.com/] appears as a clickable link in the preview, but not in the final render when saved.
This applies to at least the inline editor (tested on Stack Overflow) and question-ask page here.
Probably related bug: Inconsistent Markdown rendering between preview and final post also from after the change to CommonMark.
(Discovered on Stack Overflow; presumably the URLs in https://stackoverflow.com/posts/93132/revisions were clickable before the CommonMark changeover, but they aren't now. A recent suggested-edit changed a URL, but left them non-clickable, which I found surprising. For the current version I simply removed the
 around the URLs.)