My sidebar is broken, docfx:navrel and docfx:tocrel are wrong

[sliekens]

Hi,

I'm having problems with my docfx setup: https://github.com/sliekens/gw2sdk/blob/main/docfx.json

For some weird reason, if I build and deploy this to GitHub pages, the metadata attributes are wrong.
https://sliekens.github.io/gw2sdk/guide/introduction.html

Expected:

<meta property="docfx:navrel" content="../toc.html">
<meta property="docfx:tocrel" content="toc.html">

Actual:

<meta property="docfx:navrel" content="../toc.json">
<meta property="docfx:tocrel" content="toc.json">

As a result, the sidebar doesn't load. Also, the code keeps trying to load the sidebar without ever giving up.

I tried to reproduce it on my machine, but it worked as expected. Does anyone know what is going on here?

Debug logs:
5_Build documentation site.txt

Thanks for any help.

[glb-cblin]

I reproduce and added details in #9479