My guess is anything based on Readium Cloud Reader Lite will need to use a tex-svg codebase that works with MathJax 2.7.x and not MathJax 3.2.2.
Readium's MathJax.js strips out Tex support to save space and speed up loading and because Tex is not a part of the epub3 spec. Just like Sigil does. Your MathJax 3 based tex-svg.js works in Sigil as Sigil is MathJax 3.2.2 based. I am not sure if any Readium Readers are MathJax 3 based as very few groups have adopted MathJax 3 so far.
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