I've seen someone talking about a 3D effect in the font, but I couldn't find it again, I'm sorry. It's started to appear in my game too when the text turns dark (v1.12). It looks like the font is doubled. It's not good for the eyes
It looks like it's a bug with the shadow appearing under the text when it's white, but I'm not sure. In any case there is deffinitely something changed with the font