MathJax formulas stick when switching questions

[Krzysztof Śmiałek]

MCVE:

[#1] No jax here
> a) Right
b) Wrong

[#2] Jax: ^^E=mc^2^^
> a) That's definitely jax
b) Dunno whatcha talkin' bout

[#3] No jax again
> a) You don't say
b) Carrots

<options> {
	"format": "2.1",
	"mathjax": true
}

Third question (and first one after restart) look like this:

Issue doesn't manifest itself when Markdown is enabled.