It seems to work with 3.1.6.1:
https://pandoc.org/try/?params=%7B%22text%22%3A%22---%5Cnlang%3A+sv%5Cnmainfont%3A+Minion+Pro%5Cnmainfontoptions%3A+Numbers%3DOldStyle%5Cn---%5Cn%5CnHello+world.%22%2C%22to%22%3A%22latex%22%2C%22from%22%3A%22markdown%22%2C%22standalone%22%3Atrue%2C%22embed-resources%22%3Afalse%2C%22table-of-contents%22%3Afalse%2C%22number-sections%22%3Afalse%2C%22citeproc%22%3Afalse%2C%22html-math-method%22%3A%22plain%22%2C%22wrap%22%3A%22auto%22%2C%22highlight-style%22%3Anull%2C%22files%22%3A%7B%7D%2C%22template%22%3Anull%7D

I think it was fixed in this commit:
https://github.com/jgm/pandoc/commit/a5159c2c505cd9a87856877b3287aa0b88e4e0ba

On Wednesday, 9 August 2023 at 10:58:54 UTC+2 Stefan Björk wrote:

> Looking into it, it seems the following section:
>
> $if(babel-lang)$
> \babelprovide[main,import]{$babel-lang$}
> $if(mainfont)$
> \ifPDFTeX
> \else
>
> \babelfont{rm}[$for(mainfontoptions)$$mainfontoptions$$sep$,$endfor$]{$mainfont$}
> \fi
> $endif$
> $endif$
>
> Is expanded to:
>
> \babelprovide[main,import]{swedish}
> \ifPDFTeX
> \else
> \babelfont[swedish]{rm}{Minion Pro}
> \fi
>
> While, at the same time, `mainfontoptions` is correctly expanded with 
> setmainfont:
>
>   % xetex/luatex font selection
> $if(mainfont)$
>   
> \setmainfont[$for(mainfontoptions)$$mainfontoptions$$sep$,$endfor$]{$mainfont$}
> $endif$
>
> Expanded to:
>
>   % xetex/luatex font selection
>   \setmainfont[Numbers=OldStyle]{Minion Pro}
>
>
> I don't get it. This is the default template of pandoc 3.1.6 (I upgraded).
> onsdag 9 augusti 2023 kl. 10:44:06 UTC+2 skrev Stefan Björk:
>
>> `mainfontoptions: Numbers=OldStyle` works as expected when I don't 
>> specify a language with `lang`. When I specify a language, XeLaTeX seem to 
>> ignore the OldStyle settings. I suspect there are something broken with the 
>> default LaTeX template?
>>
>> I'm using pandoc 3.1.1.
>>
>>

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