Hastags accidentally parsed as markdown headlines

If someone uses hashtags in posts or comments, they are interpreted as headline. Here's a screenshot and a link of an example:

https://lemm.ee/post/58465311

My suggestion would be to only parse it as a headline, if between the # and the next word is a whitespace. I've seen it that way in other markdown parsers and I think that works well.

Edit: Typo