Include Entity Object When Updating The Existing Entity

This is related to how we validate the child entities inside the parent's entity constraint validator, we can use the following code to get the value of child entities.
$child_entities = $items->get('child_entity_field')->getValue();

When we adding new child entity, the new entity object can be accessed from $child_entities[0]['entity']. Below this is the structure of $child_entities when we print_r it.

Array
(
    [0] => Array
        (
            [weight] => 1
            [form] => 
            [needs_save] => 1
            [target_id] => 
            [entity] => ---> The entity object here.
        )
    [1] => Array
        (
            [weight] => 2
            [form] => 
            [needs_save] => 1
            [target_id] => 
            [entity] => ---> The entity object here.
        )
)

But, when we update the existing child entity, the entity object is not included anymore. When we print_r it, we get the following structure.

Array
(
    [0] => Array
        (
            [weight] => 0
            [form] => 
            [needs_save] => 
            [target_id] => 8
        )

    [1] => Array
        (
            [weight] => 1
            [form] => 
            [needs_save] => 
            [target_id] => 9
        )
)

What about including the updated child entity structure there just like when we add the new one? I think it will be usefull because we can use that in constraint validator in the parent entity.