gistfile1.diff

diff --git a/core/modules/breakpoint/lib/Drupal/breakpoint/Plugin/Core/Entity/BreakpointGroup.php b/core/modules/breakpoint/lib/Drupal/breakpoint/Plugin/Core/Entity/BreakpointGroup.php
index 334d2cb..e6c835b 100644
--- a/core/modules/breakpoint/lib/Drupal/breakpoint/Plugin/Core/Entity/BreakpointGroup.php
+++ b/core/modules/breakpoint/lib/Drupal/breakpoint/Plugin/Core/Entity/BreakpointGroup.php
@@ -99,6 +99,30 @@ public function __construct(array $values, $entity_type) {
   }
 
   /**
+   * Overrides Drupal\config\ConfigEntityBase::set().
+   *
+   * Special handling for setting the breakpoints property so we always load the
+   * breakpoint entities during ConfigStorageController::importChange.
+   *
+   * @see BreakpointGroup::save().
+   */
+  public function set($property_name, $value, $langcode = NULL) {
+    if ($property_name == 'breakpoints') {
+      if (is_array($value)) {
+        foreach ($value as $value_item) {
+          if (is_string($value_item)) {
+            $this->addBreakpoints($value);
+          }
+          break;
+        }
+      }
+    }
+    else {
+      parent::set($property_name, $value, $langcode);
+    }
+  }
+
+  /**
    * Overrides Drupal\Core\Entity\Entity::save().
    */
   public function save() {