How to force Doctrine to update array type fields?

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Doctrine uses identical operator (===) to compare changes between old and new values. The operator used on the same object (or array of objects) with different data always return true. There is the other way to solve this issue, you can clone an object that needs to be changed.

$items = $myEntityObject->getItems();
$items[0] = clone $items[0];
$items[0]->setSomething(123);
$myEntityObject->setItems($items);

// ...

Or change the setItems() method (We need to clone only one object to persist the whole array)

public function setItems(array $items) 
{
    if (!empty($items) && $items === $this->items) {
        reset($items);
        $items[key($items)] = clone current($items);
    }
    $this->items = $items;
}

Regarding the second question:

Does someone know how to preserve default tracking policy for other fields and use NotifyPropertyChanged just for the field that stores array?

You cannot set tracking policy just for a one field.

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