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That's what I thought first of having # in my article after when I saw in preview but when you publish it, it will back to normal.

Thanks! But they should fix it in preview too because it looks weird.

Markdown seems to have been wiped out of long form posts.

Yeah, I don't know who played with it... Maybe they had a cat at the keyboard... But some of the glitches are quite old (like the one with the links).