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DP SV ONENTITYNOSPAWNFUNCTION
From Quake Wiki
Engine-called QC prototypes:
void() SV_OnEntityNoSpawnFunction;
This function is called whenever an entity on the server has no spawn function, and therefore has no defined QC behavior.
You may as such dictate the behavior as to what happens to the entity.
To mimic the engine's default behavior, simply call remove(self).