Merge forwardport of #12736 to 2.3-develop branch

Applied pull request patch https://github.com/magento/magento2/pull/12736.patch (created by @virtual97) based on commit(s):
  1. a847d89
  2. ae62931

Fixed GitHub Issues in 2.3-develop branch:
  - #12374: Model hasDataChanges always true (reported by @Detzler)

Author: magento-engcom-team

app/code/Magento/Eav/Model/Entity/Collection/AbstractCollection.php

@@ -920,6 +920,7 @@ public function load($printQuery = false, $logQuery = false)
         foreach ($this->_items as $item) {
             $item->setOrigData();
             $this->beforeAddLoadedItem($item);
+            $item->setDataChanges(false);
         }
         \Magento\Framework\Profiler::stop('set_orig_data');
 

app/code/Magento/Eav/Test/Unit/Model/Entity/Collection/AbstractCollectionTest.php

@@ -135,6 +135,21 @@ public function tearDown()
         $this->model = null;
     }
 
+    /**
+     * Test method \Magento\Eav\Model\Entity\Collection\AbstractCollection::load
+     */
+    public function testLoad()
+    {
+        $this->fetchStrategyMock
+            ->expects($this->once())
+            ->method('fetchAll')
+            ->will($this->returnValue([['id' => 1, 'data_changes' => true], ['id' => 2]]));
+
+        foreach ($this->model->getItems() as $item) {
+            $this->assertFalse($item->getDataChanges());
+        }
+    }
+
     /**
      * @dataProvider getItemsDataProvider
      */