How to reproduce:

1. Run the command to see the line split. (See attachment: Screenshot_1)

   /tellraw @s [{"text":"<Gate Keeper> Honestly expected that to work? Bring to me a "},{"text":"Test Dungeon key to enter."}]

1. Here is the exact same quote, but in one text component (See attachment: Screenshot_2)

   /tellraw @s [{"text":"<Gate Keeper> Honestly expected that to work? Bring to me a Test Dungeon key to enter."}]