There is a conflict when you have white icons, my suggestion is that as soon as the white ones are chosen, the background if it is white (picture no1)it becomes a little gray for example (picture no2) have white but when you use it in call background the system changed to light gray (picture no2) to avoid the conflict between the whites.
In the next example, the system ignore the white conflict (picture no3) and therefore you can't see the icons well
Cover image
The system avoid the problem
The conflict
