When checking a comment in Preview, the text looks different to when it is published. When editing a comment, the Preview looks different to both the original preview and the published comment.
When typing the comment (or editing it), it looks like this:
When previewing it, it looks like this:
You can see the code bits are in red monospace
When published, it looks like this:
No indication of the code tag at all.
If I edit the comment, and preview, the preview looks different to the original preview, and the code is black monospace:
Saving an edited comment (even if no edit was made) does not make the code show in monospace (red or black).
I do like the red monospace - it highlights the code bits nicely.