LM35: About the surface of chips LM35DT/NOPB

Part Number: LM35

About the surface of chips LM35DT/NOPB, the edges of the heatsinks are damaged, exposing the internal copper. Could you please tell us if this is considered normal processing?lQDPJwvP6x8aX9_NCIDNDwCwE_rSSfJzOIUJ84LQoCizAA_3840_2176.jpglQDPKeDbaoonf9_NCIDNDwCwPasEkf77bqwJ84LQoCizAQ_3840_2176.jpg