[MC-279258] Creating a sign with formatted text serializes lines without formatting incorrectly

/setblock <pos> oak_sign{front_text: {messages: [{text: "hello", bold: true}, {text: "a"}, {text: "b"}, {text: "c"}]}}

/data get block <pos> front_text.messages

The data get returns

[{text: "hello", bold: true}, {text: "a"}, {text: "b"}, {text: "c"}]

The data get returns

[{text: "hello", bold: true}, {"": "a"}, {"": "b"}, {"": "c"}]

with the key that's supposed to say text being an empty string instead.