fix: invalidate cash_register_difference field in pos_session to ensure updated value consistency

models/pos_session.py

@@ -134,6 +134,7 @@ class PosSession(models.Model):
                         session.currency_id.format(difference)
                     ))
                     session.write({'cash_register_balance_end_real': expected})
+                    session.invalidate_recordset(fnames=['cash_register_difference'])
 
             for order in session.order_ids:
                 for payment in order.payment_ids: