hash sign at beginning of line breaks code block

[y0va]

and creates a new page in the preview. I expect this not to happen.

[maoschanz]

i think you're previewing separately each section of the document based on level 1 titles. The next section can be accessed using the little arrows at the bottom

of course in this context the code comment shouldn't be treated as a title so you might prefer to look at the full document instead:

[y0va]

Ok, yes, usable in the whole document view mode. But markdown does not parse a hash at line start in a code block as level 1 title normally.