Very recently TextComponent started outputting garbage into books. I heavily rely on a wide array of features of TextComponent to write books, and I was told an update recently did some major changes to these systems. It would seem that even after the most recent patch there are still some lingering issues.

Code that I am using (snippet, full code is available on github if needed): https://hatebin.com/btspfqjafl

To save you some time: line 137 for the TextComponent, line 89 and on for it getting inserted into the book, line 109 for how I'm setting hover text, line 201 for generating the book itself.

Visual output:

What it is supposed to look like (still working for all users that haven't updated spigot in the last few days) :