The bug

CustomName values have been changed to support JSON text. Part of JSON text is the ability to display scores, via syntax such as `{"score":{"name":"@s", "objective":"SomeObjective"}}` . But if you use this in a CustomName for an entity, it doesn't work. It also doesn't error; it just displays as an empty string.

Reproduction steps

1. Create a dummy scoreboard objective called HP (for this example):

   /scoreboard objectives add HP dummy

2. Summon a cow with that HP objective in its JSON name:

   /summon minecraft:cow ~ ~ ~ {CustomName:"{\"score\":{\"name\":\"@s\",\"objective\":\"HP\"}}", CustomNameVisible:1b}

3. Set the cow's HP score via something like

   /scoreboard players set @e[type=cow,limit=1,sort=nearest] HP 10

Watch as the name remains empty instead of showing 10. Changing the selector in the JSON from @s to @e[type=cow,limit=1,sort=nearest] doesn't fix it, either.

Workarounds

Use other means to resolve the text component and then use the /data command to copy the text component.

• Using signs
• Using loot tables