@Anomie @Jdlrobson thank you for explaining the problem. This problem was causing a bug in a python module. I made a pull request that fixes the issue (can be seen bellow the issue description).

@Anomie Thank you, those parameters are used for the content queries. But I was actually wondering if there is a formatting option for prop=sections. Something like exsectionformat=wiki but then for the section query (the first one in my first message). It looks like its using plain by default.

I saw the following in the documentation:

sections: Gives the sections in the parsed wikitext (TOC, table of contents).