> Is this the same bug as in Bug#45679?

It certainly can be, yes.
Fixing one will probably fix the other. But I decided not to guess and file this report as well, as the described case is a bit different 

пн, 1 лют. 2021 о 15:01 Andrii Kolomoiets <andreyk.mad@gmail.com> пише:
Михаил Панарин <mykhailopanarin@gmail.com> writes:

> Sometimes assignments are not fontified or fontified incorrectly.

Is this the same bug as in Bug#45679?
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=45679