Bug : for some reason, when a Cargo query is run on a page, TOC simply disappears. On "Page Information" it shows the the page has the __NOTOC__ magic word, even though I never used this magic word on the page or in some template.
Initially I thought it was because my table had a non-ASCII character ("é"), but I recreated all the tables with accents (é -> e), and it's still happening.
The only workaround is to use __TOC__ or __FORCETOC__.

Steps to reproduce:

1. Create a page with the minimum amount necessary to automatically render the TOC
2. Query a table (before the first heading)
   • TOC does not render. If you inspect the page, is not even just hidden with some CSS setting.

Example pages:

• Example 1 - Multiple headings, TOC does not render. If you remove the first template at the top of the page ({{poképrevnex}}) and preview, the TOC renders normally
• Example 2 - Multiple headings, TOC does not render.
• Example 3 - Just like Example 1, but I had to include manually the __TOC__ magic word. If you remove it, the TOC will not render.

I would recommend testing this on test3 before upstreaming it (especially because I don't know if my pages are the best example and they're not in English).