Are you using the latest pandoc release?

Here's a recent commit in texmath that may affect this:

commit 5b337e57b80831b624f52dd250ab5d612ee94b88
Author: John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org>
Date:   Sat May 6 10:31:42 2023 -0700

    Remove escaping of spaces inside \text{}.
    
    It isn't needed, and it causes problems in MathJax rendering.



> On Apr 11, 2023, at 11:12 PM, Bernard Schleich <bernard.schleich-Re5JQEeQqe8@public.gmane.orgm> wrote:
> 
> I'm trying to convert a big mathematical article (32 pages) with a lot of mathematical expressions from docx to wikimedia.
> 
> When, from Wikipedia Sandbox, I incorporate wikimedia file generated by pandoc, the following line are refused by Wikipedia
> 
> <image_2023-04-12_081228333.png>
> {| class="wikitable"
> |-
> ! 1)
> ! <math display="block">S_{m} = \int_{0}^{a}{\varepsilon^{m}\text{\ }\psi(\varepsilon)}\text{\ }\text{d}\varepsilon</math>
> |}
> 
> after replacing \text{\ } by \  or ~, the formula is accepted !
> 
> This error occurs also when text is containing space as in following exemple
> 
> {| class="wikitable"
> |-
> ! 9)
> ! <math display="block">\varphi(\sigma_{1})_{2}\delta_{1} = \{\begin{matrix}
> \frac{4\sigma_{1}}{a^{2}}\delta_{1} & \text{für\ }2\sigma_{1} < a \\
> \frac{4(a - \sigma_{1})}{a^{2}}\delta_{1} & \text{für\ }2\sigma_{1} > a \\
> \end{matrix}</math>
> |}
> 
> After having replacing \text{für\ } by \text{für}~, the formula is accepted !
> 
> I know that error is detected in Wikipedia, but I ask my question to Pandoc because Wikipedia is first to use wikimedia ! 
> 
> Is that a bug ?
> 
> Is there a parameter that I can use and that avoid to write \  in \text{...} Latex expression ?
> 
> Thanks for any help !
> 
> 
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> <image_2023-04-12_081228333.png>

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