Latex macros starting with `\n` like `\nabla` don't work when present in `$$` blocks (extras: `latex`, `breaks`)

[Julynx]

Describe the bug

All latex macros that start with \n, such as \nabla or \neg are not parsed correctly when present in $$...$$ blocks. (They work correctly in single $...$ blocks, though). I'm using extras latex and breaks.

To Reproduce

1. Enable extras latex and "breaks": {"on_newline": True}

2. Try converting the following Markdown to HTML:

   • $\nabla$ --> Works! (Produces the ∇ character)

   • However, $$\nabla$$ does not work (Produces <mrow><mi>a</mi><mi>b</mi><mi>l</mi><mi>a</mi></mrow>)

The source of the error is probably that the \n part of \nabla gets interpreted as a literal line break instead of as part of the latex macro. As shown above, this happens only in latex "blocks" $$...$$ and not with inline latex $...$.

Expected behavior

See below how Github markdown renderer succeeds at parsing the operator:

$$\nabla$$

(Text above is literal $$\nabla$$)

Same with neg:

$$\neg$$

(Text above is literal $$\neg$$)

Debug info
Version of library being used: 2.5.4

Any extras being used: latex, breaks