The bug
As of 18w43a, the first 1.14 snapshot, the "hitbox" for the cursor is incorrectly aligned for book click/hover events, meaning you can sometimes click the line above accidentally instead of what your cursor was hovering over.
How to reproduce
/give @p minecraft:written_book{pages:["{\"text\":\"Link to PAGE 2\",\"color\":\"blue\",\"clickEvent\":{\"action\":\"change_page\",\"value\":\"2\"},\"hoverEvent\":{\"action\":\"show_text\",\"value\":{\"text\":\"Hover text\"}}}]","[\"\",{\"text\":\"This is PAGE 2\"}]"],title:"Test Book",author:"?"}Hover your mouse over the top half of the line.
Here is a video demonstration: https://youtu.be/0GVYpVo99Jk
Comments 4
1.13.2 is unaffected and the first 1.14 snapshot, 18w43a, is affected. Probably due to the book editing changes that were introduced.
How to reproduce:
Create a simple book:
/give @p minecraft:written_book{pages:["{\"text\":\"Link to PAGE 2\",\"color\":\"blue\",\"clickEvent\":{\"action\":\"change_page\",\"value\":\"2\"},\"hoverEvent\":{\"action\":\"show_text\",\"value\":{\"text\":\"Hover text\"}}}]","[\"\",{\"text\":\"This is PAGE 2\"}]"],title:"Test Book",author:"?"}Open the book and notice that the hover text does not appear and clicking has no effect for the top 1/3 of the line.
Confirming for 18w48a.