I'm still having problems - see https://math.codidact.com/posts/289006/289007#answer-289007 - doesn't work with $ or (previous attempt) \$.

Looks like Peter Taylor has now edited that answer to add double back slashes before every dollar sign, which seems to have the intended effect.

Looks like there are still issues with this. The edit history of that answer shows 2 new backslashes per dollar sign, but only 1 of them is marked as an insertion (by being underlined), which is misleading.

Note that in your comment both attempts render as a dollar sign, even though the context suggests at least one of them contained other characters.

For describing in comments it might work better to describe in words, or to enclose the characters in backticks to give inline code like \\$ and \$, which render as \$ and $.

I'm not sure whether this current behaviour of comments should count as a bug or not.

I'm not concerned about this in comments, only in regular posts/questions/answers.