When we get the content of a book (e.g. the first page), the first paragraph is written in color, but the next are all in black as the attach file show it.
Even if I don't color the text (which is white by default), the next paragraphs are always black.

I'm using the plugin Skript to get the content of the book, but according a [skript] java developper, it's a Spigot issue.
And if it's not, it's at least Minecraft issue and I would like to know if it's fixable.