Hiding the toc_js block not working when minimum elements is not respected with custom css

This is superceded by 🐛 [theming] Show/Hide TOC elements entirely using CSS classes Needs review , and your issue may be easily resolved with:

.toc_js {
    display: flex;
}

.toc_js.is-hidden {
    display: none;
}

The solution in that issue keeps compatibility with the existing behaviour of it being hidden by default.