Post editor; Heading not working for less than 3 charactors

Hello, I have some questions with the Heading.
When I have a word less than 3 characters, the Heading does bot work with it. For example:


I have to add a ā€œ-ā€ to make the heading apply:

I am not sure this is a bug. Anyone could explain this?
Thanks

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Seems to be a bug specific to Marked

http://johnmacfarlane.net/babelmark2/?normalize=1&text=in --

Fixed now:

in

:relaxed:

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