KaTeX auto equation numbering stopped working

[disberd]

I was made aware of this issue via an issue on PlutoExtras and while debugging I realized that since version 0.20.16 of Pluto, the automatic equation numbering of KaTeX is broken, as it shows all equations with the same number (1).

See below a minimal reproducer example screenshot:

The KaTeX implementation relies on CSS counters for numbers, but plain use of HTML with CSS counters still seem to work on v0.20.16 (see image below) so it must be something a bit more convoluted.

HTML reproducer

    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.16.8/dist/katex.min.css">
    
    <div id="eq1"></div>

    <div id="eq2"></div>

    <script src="https://cdn.jsdelivr.net/npm/katex@0.16.8/dist/katex.min.js"></script>
    <script>
        const equations = [
            '\\begin{equation}\nE = mc^2\n\\end{equation}',
            '\\begin{equation}\na^2 + b^2 = c^2\n\\end{equation}',
        ];

        equations.forEach((eq, index) => {
            const container = document.getElementById(`eq${index + 1}`);
			katex.render(eq, container, {
				displayMode: true,
				throwOnError: false
			});
        });
    </script>

@fonsp any idea on what might have caused it? I don't see anything obvious from the v0.20.16 release page