Advancement description JSON can ignore the first specified color

The Bug

If you're writing an advancement description with JSON, the description will ignore your first specified color, no matter if it's a word or a hex value, and use the default color instead. This is different to how it used to work.

The Workaround

Instead of writing

{"text":"Kill three unique mobs with one piercing crossbow shot","color":"white"}

write this

["",{"text":"Kill three unique mobs with one piercing crossbow shot","color":"white"}]