A CriticMarkup comment — {>>comment<<} — (sometimes?) will cause the paragraph it's in to overwrite itself (multiple lines of text displayed on one line) if the comment isn't preceded by a space and if comments are hidden in Marked Version 3.2.0 (1214).
Reproduce (usually):
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris{>>((OK))<<} nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
In Marked, after un-checking ⚙️ > Proofing > Show Comments and Footnotes:
Add a space before the CriticMarkup comment and save the file:
However, sometimes the same glitch seems to happen with a preceding space, and sometimes it doesn't happen when there is a space. Maybe it's the act of unchecking the Show Comments and Footnotes box? Not sure.