Steps to reproduce:
- Go to https://en.wikivoyage.beta.wmflabs.org/wiki/Tokushima
- Note the Table of Contents, which is in the banner image at the top.
- Open the page in VisualEditor and make a change.
- Save the page, and note that the MediaWiki default TOC has appeared.
Workaround: Reload the page to make the extra TOC disappear.