This might not be a glitch, but rather an illusion.
There is an illusion involving 2 solid colored objects appearing to be a different color when the background is a darker or lighter shade. However, when comparing the solid objects together next to each other, they are in fact the same color.
This is the same thing here. The text color is not fading. The sign's surface shadow makes the text look like it's different because of the background of the sign. The text is the same color.
This might not be a glitch, but rather an illusion.
There is an illusion involving 2 solid colored objects appearing to be a different color when the background is a darker or lighter shade. However, when comparing the solid objects together next to each other, they are in fact the same color.
This is the same thing here. The text color is not fading. The sign's surface shadow makes the text look like it's different because of the background of the sign. The text is the same color.