fix: correctly determine 'SER' suffix

src/Entity/Destination.php

@@ -154,7 +154,7 @@ class Destination implements TimestampableEntityInterface, SoftDeletableEntityIn
         }
 
         if (str_starts_with($hotelCode, 'SER')) {
-            return substr($hotelCode, 2, 3);
+            return substr($hotelCode, 3, 3);
         }
 
         return substr($hotelCode, 0, 3);