Books are not working correctly in vanilla spigot 1.8 (no plugins).

Summary:
Books with JSON text are not working and show the raw JSON text.

Full details here:
http://www.spigotmc.org/threads/json-click-data-hideflags-tag-item-attributes-not-working.3817

Here is the test data to duplicate the issue:
1)
/minecraft:give @a written_book 1 0 {pages:["{\"text\":\"\",\"extra\":[{\"text\":\"Click and Hover event\",\"color\":\"aqua\",\"bold\":\"true\",\"underlined\":\"true\",\"clickEvent\":

{\"action\":\"run_command\",\"value\":\"/minecraft:say Meep\"}

,\"hoverEvent\":{\"action\":\"show_text\",\"value\":{\"text\":\"\",\"extra\":[

{\"text\":\"Hello!\",\"color\":\"white\"}

]}}}]}"],title:Book,author:TellrawGenerator}
and
/give @a written_book 1 0 {pages:["{\"text\":\"\",\"extra\":[{\"text\":\"Click and Hover event\",\"color\":\"aqua\",\"bold\":\"true\",\"underlined\":\"true\",\"clickEvent\":

{\"action\":\"run_command\",\"value\":\"/say Meep\"}

,\"hoverEvent\":{\"action\":\"show_text\",\"value\":{\"text\":\"\",\"extra\":[

{\"text\":\"Hello!\",\"color\":\"white\"}

]}}}]}"],title:Book,author:TellrawGenerator}

Also, Books written and signed in the game are changing text (see thread for example).