Steps to reproduce
In any note, insert two equals signs or hyphens after a line of normal text. These will show as h1 or h2, respectively.
Insert more than two, however, and they will only display as normal text.
Did you follow the troubleshooting guide? [Y/N]
Y
Expected result
h2 header
--
h2 header
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Actual result
h2 header
--
h2 header
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Extra Notes
The question ‘2 lines of normal text followed by — lines formats like a header in Editor mode, but doesn’t in preview’ was technically answered, but not in a satisfying way. Any header after a line of normal text will format as a header in Editor, but not Preview. This behaviour does not appear desirable to me; would there be any reason for it to persist?