When adding a new comment to a ticket (or updating an existing comment), formatting of text and file attachments do not render correctly when the comment is saved. Instead, you see the markdown.
This only appears to be an issue in the new issue view, although there is now no longer the ability to adjust text formatting or upload files in comments on the old view.
This is particularly problematic when adding screenshots.

Can anyone outline whether this is something that can be corrected in set-up or whether this would point to a problem for Atlassian to fix?