Hi @datgausaigon,
thank you for your post. The issue with TOC not loading inside the nestable elements (or if element is hidden at page load), is a known one, and we already have an internal task for it - we are working on it.
Because of the same issue, I’ll mark your post as a duplicate and close it. Please follow the following topic, as we will update it, once we release a fix.
Thank you,
Matej