Cannot post question using specific MathJax because of warning about missing code formatting

Question

On Mathematica SE, this snippet couldn't be submitted as a question

some text...

some more text....

$$

\rho_h(f)=R_h(f)/R_0(f)

$$

The error was

Your post appears to contain code that is not properly formatted as code. Please indent all code by 4 spaces using the code toolbar button or the CTRL+K keyboard shortcut. For more editing help, click the [?] toolbar icon.

I really couldn't figure out the typo, if any. Is this a bug? Please help.

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EDIT: the suggested solution here is about the use of ` during code formatting which, as far as I know, is mutually exclusive from LaTex formatting

Answer 1

This solves it

$$
\rho_h(f)=R_h(f)/R_0(f)$$

instead of

$$
\rho_h(f)=R_h(f)/R_0(f)
$$

This is surprising since its not a problem on Physics SE.
Hope the Mathematica code checker can be updated to accommodate this, imho, common way of writing.