When a scoreboard objective is set to the `below_name` display mode, all named entities with no score display it with a score of 0

The bug

Since MC-99647 was fixed, below_name scores started appearing for all entities, not just players. However, these values are visible even for entities without scores, so every named entity in the world shows a 0 value, such as named mobs and item frames.

A use case like displaying player deaths below their names now additionally makes all other named entities display 0 deaths despite not having any score.

How to reproduce

1. /scoreboard objectives add test dummy
   /scoreboard objectives setdisplay below_name test
   /summon cow ~ ~ ~ {CustomName:"joe"}

2. Look at the cow

Expected behavior

Just shows the name “Joe” since the cow has no score

Observed behavior

Shows “Joe” and “0 test”