When include siblings is mentioned, org-make-toc assumes the table of contents is the first item

[hemanta212]

In case of

* Main heading
* * STH ELSE

* * Table of contents
     :properties:
      :TOC: :include siblings
     :end:

* * OTHER THING

Then the toc generated will look sth like

:content:

• Table of contents
• OTHER THING

:end:

skipping the STH ELSE and including Table of contents

[alphapapa]

Thanks, hopefully a simple bug to fix. I probably won't have time to work on this soon, so patches welcome.