[MC-124163] Name NBT Tag formatting doesn't display an error for invalid JSON

The bug

The name nbt tag doesn't produce an error when it is changed to a not formatted string. And the name will not be shown.

How to reproduce

Run:

/give @p minecraft:diamond_ore{display:{Name:"This Will not appear."}}

Throw the item on the ground
Run:
```
/data get entity @e[type=item,limit=1,sort=nearest]
```
→ You will see the tag is set but not displayed

What should happen

The game should show an error, much like book pages do when invalid JSON is used as a value (producing the message "invalid book tag").

Comments 2

user-f2760 2018-01-12T08:29:44Z

the Name and CustomName tags need to be valid json, use

Name:"\"Name here\""

Skylinerw 2018-01-12T08:45:53Z

Re-wording the ticket slightly to put more focus on the lack of error and re-opening. Book pages display an error for invalid JSON, so there is precedence.