Looks like a bug situation
normal
Note that the first image, the “Favorites” Tab button and the “Trash can” button in the upper right corner, are gray (they should be white). In this case, there is no problem with the code (unless you deliberately set it to gray).
To deepen the color
As shown in the image above, Settings -> General -> Accessibility -> Burn color, which turns the pure white button to gray if you turn it on (which you probably do). I haven’t tried any of the other colors, but as a reminder, when you do this test, make sure you have this option turned off.