Dettorer

Note: the problem is still there if I don't check any of the destination headers in the extension's preferences (To, Cc, Bcc, Newsgroup), but it goes away when I uncheck...

In a project that uses kaobook I fixed a compilation warning that seems related[^1]. Can you try adding the following lines to your document? If that fixes it I'll try...

Wait, now I see that it doesn't fix your issue, it just sets a (incorrect even?) level for the margin toc sections, but doesn't prevent them from appearing twice.

Ok so after a more careful inspection of this issue, it seems that my fix is completely misguided and we're simply both using an old version of kaobook. This issue...