ENGCOM-4823: [Backport] Same product quantity not increment when added with guest user. #21375 #22378

Author: sidolov

app/code/Magento/Quote/Model/Quote/Item/Compare.php

@@ -50,7 +50,7 @@ protected function getOptionValues($value)
         if (is_string($value) && $this->jsonValidator->isValid($value)) {
             $value = $this->serializer->unserialize($value);
             if (is_array($value)) {
-                unset($value['qty'], $value['uenc']);
+                unset($value['qty'], $value['uenc'], $value['related_product'], $value['item']);
                 $value = array_filter($value, function ($optionValue) {
                     return !empty($optionValue);
                 });