For some reason, if i put initialLatex: “S_{\infty}=” ,the input math box displays correctly, but the script checking against the numerical value in the input box marks it wrong.
I’m also interested in hearing if there’s a solution for this!
After tinkering around, I think the problem extends to any subscripts that aren’t allowed in the calculator, i.e. that contain something other than numbers and letters (S_{n-1}, S_{\alpha}, …). If you make a Boolean like S_{\infty} = S_{\infty}, even that isn’t successfully parsed and does not evaluate to true.
As a workaround, one possibility would be using placeholderLatex instead of initialLatex.