When I flag something "in need of moderator intervention," I can use similar mini-Markdown as comments which appears correctly rendered when I view my flag history.
However, I have received a couple helpful flag feedbacks from moderators where they have also attempted to use similar mini-Markdown available in flags, yet it comes through unparsed when I view my flag history.
Here are two snippets of unparsed Markdown in helpful flag feedbacks I have received1:
I'd rather they just *not*
isn't _quite_ the
While I am able to parse this simple Markdown in my head, I don't think that doing so should be necessary. Beyond this, some Markdown adds functionality like [some link](URL) which unparsed would at best be confusing for the recipient.
Additionally, it appears the asymmetry is confusing for moderators who are attempting to use Markdown where it is unsupported. Since neither the "in need of moderator intervention" flag textbox nor the flag feedback textbox supports a Markdown preview (in the same way that comments and chat do not), there is no immediate indicator that the flag feedback field would not behave the same way the others do.
1The feedback has been reduced to just the issue so as to not give information about the nature of the flags. There also may be more instances, but I have almost 70 pages of helpful post flags and there's no way to filter just flags with feedback (but that's a different issue).