Yes, you are correct.
Sorry if my comment caused confusion.
I was just joking about that this “bug” is solving the feature requests
(but only for CMC)
from @Hubiug back in March.
Yes, for compleatnes the CMC should be fixed, though it’s not a big deal,
while waiting for the proper implementation of the feature by @Hubiug,
i.e. shading the seconddary sousers, but only in compare mode.