I'm specifically seeing mouse over tooltips disappear when "Remove conflicting tags" is selected. They show up when using an iframe (remove tags unchecked) but that's not ideal, since this is a really long page.
The HTML5 (Bootstrap) pages we're trying to use are generated by the tool DBSchema (https://www.dbschema.com/). The pages use title tags within an SVG <a> element to identify the popup text to be shown. I'm reaching out to the support team there as well, but I thought maybe someone had run into this issue under other circumstances.