Stephen Eglen <sje30@cam.ac.uk> writes:

> In brief: x̅ does not appear as x with an overline in the JuliaMono font.
>
> emacs -Q
>
> (set-face-attribute 'default nil :font "JuliaMono")
>
> (insert 611 773 32 120 773)

I'm unable to reproduce this in Emacs 27.1 on Debian bullseye: