Minecraft 1.14 data pack mob drop issue [duplicate]

Solution 1:

Not enough escaping.

{
  "type": "minecraft:item",
  "name": "minecraft:paper",
  "functions": [
    {
    "function": "set_nbt",
    "tag": "{display:{Name:\"{\\\"text\\\":\\\"Test\\\"}\"}}"
    }
  ]
}