Bug: Unicode characters have the backslash cut off, so they don't work

[DoubleF3lix]

[Assassin](red, hover_text=<[Assassin](red)

[\u2764Health ](red) [- 20](white)

[3x](gray)>)

["", {"text": "Assassin", "color": "red", "hoverEvent": {"action": "show_text", "contents": ["", {"text": "Assassin", "color": "red"}, {"text": "\n\n"}, {"text": "u2764Health ", "color": "red"}, {"text": " "}, {"text": "- 20", "color": "white"}, {"text": "\n\n"}, {"text": "3x", "color": "gray"}]}}]

(Note the "u2764Health")

For now, I'd use a placeholder for the \ and then find replace it in your code. For instance, I use & and replace &u with \u

[DoubleF3lix]

Fixed in 1.3.0