Resolve #3491369 "Fix suite"

Closes #3491369

src/Element/ComponentElementAlter.php

@@ -53,7 +53,7 @@ class ComponentElementAlter implements TrustedCallbackInterface {
         unset($element['#slots'][$slot_id]);
         continue;
       }
-
+      $slot = SlotPropType::normalize($slot);
       // Because SDC validator is sometimes confused by an empty slot.
       // We check the current slot render element.
       if (is_array($slot) && self::isSlotEmpty($slot)) {
@@ -61,7 +61,7 @@ class ComponentElementAlter implements TrustedCallbackInterface {
         unset($element['#slots'][$slot_id]);
         continue;
       }
-      $element["#slots"][$slot_id] = SlotPropType::normalize($slot);
+      $element["#slots"][$slot_id] = $slot;
     }
     return $element;
   }