Signs, when placed on walls and dyed, show an incorrect text colour if they face north or south.
This is particularly evident with light colours and makes almost impossible to read the text.
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The colors are indeed identical, the problem is that signs rotated differently have a different brightness, while the text remains the same. This results in some signs being unreadable, as the same text color can be lighter or darker than the background. The description of this bug should be changed to "text on signs does not change its brightness along with the sign's texture". I opened another issue, https://bugs.mojang.com/browse/MC-168170
See MC-33304.
The colors are the same. This is an optical illusion.