Board Thread:Support Requests - Getting Technical/@comment-26354798-20201006171026/@comment-45117243-20201012201726

I tested it back then on legacy, and indeed it was mostly the same results. I think the headers didn't escape the div.hidden but did escape the center tag.

Well, I guess meantime the advice is to avoid using headers inside any other element in article pages, blog pages and templates intended for them.