Hello William, 
Thanks you for your reply, 

I can't share the whole output as it includes the whole document, but using 
the verbose option it proved my theory, 
that it do print the html file after generating it, thanks for the tip.

no obvious error messages and the here is the command passed to wkhtmltopdf 
``` wkhtmltopdf "--margin-bottom" "1.2in" "--margin-top" "1.25in" 
"--margin-right" "1.25in" "--margin-left" "1.25in" 
"--enable-local-file-access" "./html2pdf1272404-0.html" 
"./html2pdf1272404-1.pdf"
then the TOC in the html is like so 
 ``` 
<nav id="TOC" role="doc-toc">
<ul>
<li><a href="#introduction">Introduction</a>
<ul>
.
.
.
</ul></li>
</ul>
</nav>
``` 

then the reset of the pdf and the last couple of lines are 

```
Loading page (1/2)
Printing pages (2/2)                                               
Done                                                           
```

I am not sure if that enough for analysis, but I will also try to analyze 
it later, will go with weasyprint for now.

Regards, 
George 
On Wednesday, March 29, 2023 at 3:29:41 PM UTC+2 William Lupton wrote:

> George,
>
> If you set pandoc's --verbose flag then you get a lot of detailed output, 
> including the wkhtmltopdf command line and the generated HTML (that is 
> passed to wkhtmltopdf).
>
> If you'd be happy to share any or all of this output (or send it to me 
> directly), I'd be happy to take a look and see whether anything obvious is 
> going on.
>
> Cheers,
> William
>
> On Wed, 29 Mar 2023 at 13:17, Albert Krewinkel <albert...-9EawChwDxG8hFhg+JK9F0w@public.gmane.org> 
> wrote:
>
>> Hi George,
>>
>> George Emad <engr.ge...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>>
>> > 1) Is this a normal use case when I use different file extension than
>> > the format after -t ?
>>
>> Absolutely. Pandoc supports multiple PDF engines, and both the `-t` and
>> `--pdf-engine` parameters are taken into account when deciding which
>> format and which engine should be used. If the `--pdf-engine` parameter
>> is given, then pandoc uses that engine together with the appropriate
>> output format; if `-t`/`--to` is given then a engine is picket.
>>
>> Here's the list of formats and suitable engines:
>>
>>   - latex: pdflatex, lualatex, xelatex, latexmk, tectonic
>>   - html: wkhtmltopdf, weasyprint, pagedjs, prince
>>   - context: context
>>   - ms: pdfroff
>>   - typst: typst
>>
>> The first engine for each format is the default engine. So by using `-t`
>> you triggered PDF generation through wkhtmltopdf, which, it appears, is
>> installed on your system.
>>
>> > 2) How can I fix this bug with the TOC ?
>>
>> My recommendation would be to try one of the alternative engines. If
>> that doesn't work, please file a bug report in the issue tracker at
>> https://github.com/jgm/pandoc/issues
>>
>>
>> -- 
>> Albert Krewinkel
>> GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124
>>
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>> .
>>
>

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