this issue persists. see the multivariate normal page for example. following the suggestion made by Eldoprano fixes the issue.

https://www.wikiwand.com/en/Multivariate_normal_distribution

For the ones having this problem, you can download the extension "Stylus" and add this fow wikiwand:
.equation-box {
background-color:#00000000 !important;
border-color: #424242f0 !important;
border-radius: 1em !important;
}

For the developers:
... Please fix this problem.. Here an example of an article's equation being massacred by this error:
https://www.wikiwand.com/en/Entropy_(information_theory)

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body.dark img.mwe-math-fallback-image-inline {filter: invert(1);
that's my way.

Workaround: https://chrome.google.com/webstore/detail/wikipedia-with-mathjax/fhomhkjcommffnlajeemenejemmegcmi