So, I updated Emacs to latest git version and the extended face works for all attributes. However, it brings in other edge effects:
1. the extension backwards wraps to the previous line in some cases and 2. my cursor disappears if it is past the last character on the line when using a block cursor in evil mode. So I'm back to what I had before until Emacs stabilises a bit in terms of face extensions. And enough off-topic discussion, I think! Apologies to all for the noise. -- Eric S Fraga via Emacs 27.0.50, Org release_9.2.6-552-g8c5a78
