the colored text in minecraft (made using the § symbol followed by a caractere like f(very white) or 1(blue) for example

used like this;

§f test

for example will have the word test in very white to neon white)

as been darkened when used on sign any color from green to red and even white as been dramaticaly darkened and this can be annoying ( not gamebreaking ) but a lot of build using wroten things on sign for explaination or world building can be worsen or made unplayable because of this little bug