So the example didn't work, because you do have a font for those
characters. Can you find some characters that don't have fonts? For
example, do any of the scripts in etc/HELLO show as tofu or "blank"?
(I'm trying to understand why you had those blank displays where you
should have seen tofu; if you are not interested in trying to figure
this out further, I'm fully prepared to stop asking questions.)
I'm willing. FYI, I'm using the prebuilt emacs 28 from https://emacsformacosx.com/
I don't build my own.
Here are two images showing the whole HELLO file.
