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missing Generic L2CAP payload after the SM pairing rsp

I updated the original question

Hi, I am working with two nRF52 SDK13 central and peripheral, with no display, each is connected thought UART to a software interface, so I am mimicking the example multi role lesc,

I am able to pair, bond and encrypt the link, but I am wondering why I am getting a empty Generic L2CAP payload after the SM pairing rsp, it happens to each new connection when bonding, and if I am not bonding it happens always to each connection.

my sniffer capture:image description

The only difference between "my application" or multirole_lesc example mimic is. on my application, I am not performing a discovery service because I know where are all my handles for each characteristic and I connect only my own devices.

my code for the ble events realted to security

my scenario is pretty similar to this guy:what-is-the-reason-for-ble_gap_sec_status_dhkey_failure/

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