can we talk about how colour blindness is very common in Murder Drones.
In all the POV shots, the only character who see's colours is Doll while Uzi, N, and Kenzie Day are all colourblind (specifically cone monochromacy). We also know Alice isn't colourblind since she identified Nori's yellow eyes.
So when Uzi's eye(s) turn yellow or bleeds blood instead of oil; no one points it out because most characters wouldn't be able to tell.
Edit. if you look in the reblogs, I've done a lot more investigating and found N is colour blind but not Uzi. Check it out.