LAUNCHXL-CC26X2R1: can't get GAPBOND_PAIRING_STATE_ENCRYPTED fail status from stack as slave

Tool/software:

Hi,

(sdk version simplelink_cc13xx_cc26xx_sdk_7_41_00_17)

When I use a paired phone (as master) to reconnect cc2642 (as slave), I can get a GAPBOND_PAIRING_STATE_ENCRYPTED Success status callback from stack.

But if I delete the bond info on cc2642, and then use the paired phone to reconnect cc2642, I couldn't get the GAPBOND_PAIRING_STATE_ENCRYPTED  HCI_ERROR_CODE_PIN_KEY_MISSING status callback from stack.

How could I get the GAPBOND_PAIRING_STATE_ENCRYPTED   Fail status callback as a slave?

Thanks!