Cannot replace MacOS San Fransisco fonts.

The MacOS font suite, San Fransisco, is buggy in Xd. It will frequently replace itself with a placeholder font, even when its enabled in Fontbook. The "Replace font" will sometimes be disabled here. I don't know why. so I get stuck with these messed up fonts and my file is pretty much destroyed. I'd like to be able to remove SF from my files entirely but I can't do that either for the same reason.