What is particularly hilarious is that the button isn't setting the color of a line below the text but of the text itself so why is the icon changing the color

What is particularly hilarious is that the button isn't setting the color of a line below the text but of the text itself so why is the icon changing the color of an underline? The only answer I can think of is that they tried to set the text color on the button but then the button was entirely invisible so rather than taking a step back and realise that they might need to rethink they just coloured an underline instead.