I checked it with non-Latin symbols like Cyrillic and it’s not working. When I copy the url of the subheader and try to follow the link - the TOC is not working (the page opens, but doesn’t move to the subheader). How can it be solved?
إعجاب واحد (1)
If this issue existed before, it doesn’t nowadays after testing. 
إعجابَين (2)