I think the provided example is at fault? If I use $$ instead of $$$ the 1st example works. The second doesn't, though:

Edit: Ok, the 2nd example works if I use $ instead of $$

I can confirm this issue. It seems that using \[ \] for display math and \( \) for inline math works, which is in accordance with LaTeX.

@taohonker what is the correct way to do it? Is \[ \] a workaround? How to use it? Sorry I am new to this.

In LaTeX, \[...\] is equivalent to $$...$$. But in anywhere else you cannot find an always-correct way. At least in Boostnote \[...\] works.

This isn't a bug the problem is that "$$...$$" is being used for inline Katex code

Edit: I meant to say "text can't be on the same line as the katex code block"

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then Boostnote is working fine. It's only the examples on the wiki are both incorrect / possibly outdated.

It is outdated. That was the way it used to work before. now it is customisable. with the defaults being $...$ for inline and $$...$$ for block

You can change them to work the way they did before if you like, but i prefer the way they work now.

@OnlineVagrant ok , thank you for clarifying. 👌 I'll close the issue.