When a player moves away from an entity and then gets closer to its previous location, the entity disappears from the world. This issue occurs only with entities from the same world, and not with player entities. The disappearance of entities can occur randomly and is not limited to specific types of entities.

steps:

 1. Randomly search for an entity in the world

 2. Move away from the entity until it disappears from view

 3. Move back to the previous location of the entity

 Expected result:

 The entity should reappear in its original location when the player returns to the previous location.

Observed Result:

 1. The entity does not reappear, and its disappearance becomes permanent.