When an entity is killed and a score is assigned to that entity in the same tick, but after it was killed (using functions and @s), a scoreboard entry is created that can't be deleted easily. One would expect scoreboard entries of dead entities to be removed.

How to reproduce

1. Create a function with two commands:
   kill @s
   scoreboard players set @s <some_objective> 1
2. Execute this function as some entity.
3. Inspect the scoreboard using the sidebar
4. Notice a scoreboard entry with the UUID of the entity that was killed by the function.

This behavior was not present before 1.17.