Apple Mail 12.2 - Formatted emails are not formatted correctly

I know this, but this does not cause the described problem. Recipients will display emails by their html or plain text, they will apply formatting as per their settings. But they will not as per their settings just switch around fonts within an email between my signature and the email body, or even between portions of the email that contain e.g. bullet points/bold text and those which don't.

Usually, if not always, this results in: I set a font in Apple Mail settings. In good faith, recipient email programs will display this font, but only, as mentioned, in signature or paragraphs with explicit format settings. This is not a recipient side setting issue, because the phenomenon occurs in all recipients (except those who only display plain text).

This, too, is not the problem, as I see it. I set Optima Regular as email font. Since recipients will display portions of my email in this font, they do have this font.

I have added an image to my original post to clarify.

Yes, I suspected that this is still an unsolved bug. And meh, Outlook. ;-)

A bug, in the sense of: Why would it be intended operation to have a font setting that is applied to signatures and portions of an email that are specifically formatted (bullet points, bold text), but leave other text/paragraphs unformatted. Even worse, as seen in the image I posted, it seems to occur randomly.

Thunderbird, Outlook, other respectable mail clients: "Let's allow people to format their emails and do the best we can to display them as such, if our users want it and don't make other settings. We're actually pretty good at it by now"

Apple Mail: "Meh, I will randomly format whatever however"