In #12008, all html files were made to behave as a page resource rather than getting copied into public. In previous versions, it was possible to make HTML files render as-is by having no front matter.
I have some HTML files which are computer-generated simulations (see the last link on this page. Previously, I was able to include these in my webpage as html files without front-matter were copied to /public on build. Is this no longer possible?