yes it does, it has a little piece that lights up red and iluminates the f/ stop. How could it be that Beseler made such a mistake,
It's not a mistake, it is intended to be used for black-and-white printing, not color work (red has no effect on black-and-white papers; that's why safelights are red...). Tape the opening on the back of the lensboard with lightproof tape or foil and print away, your cyan spot will likely be gone.
And, if it really bothers you, you can easily get lensboards for your Beseler without the illumination rod.