Simple TOC overwrites anchors created via Gutenberg

Hi Marc, beautiful plugin, I appreciate a lot its lightness and simplicity.

Anyway I noticed a bug after the update to the last version (5.0.17): the plugin seem to overwrite previously TOC created by adding an id to the headings via Gutenberg interface.

For example, in the post https://www.lucarosati.it/blog/guida-progettazione-menu I’ve added the ID organizzazione to the heading Organizzazione delle voci; however the anchor #organizzazione doesn’t work, even if the post doesn’t use the plugin – see https://www.lucarosati.it/blog/guida-progettazione-menu#organizzazione

The page I need help with: [log in to see the link]