in MathJax, Latex, Double \underbrace{}_{} doesn't work

[ManeraKai]

Problem

Works:

$$ \underbrace{x+y}_{z} $$

Doesn't work:

$$ \underbrace{x+y}_{z} + \underbrace{x+y}_{z} $$

Also doesn't work:

\\( \underbrace{x+y}_{z} + \underbrace{x+y}_{z} \\)

Steps

No response

Possible Solution(s)

No response

Notes

I tried this on MathJax's web demo, it works fine over there.

Version

mdbook v0.4.43

[ehuss]

Thanks for the report! You need to escape the underscores because otherwise they are being interpreted as markdown italics.