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Callback function is not called from SDK 12.3 peer manager.

I am updating the application software that was created based on ble_app_multilink_central in SDK 9.0 to 12.3.
When replacing device manager with peer manager, I received an event of BLE_GAP_EVT_CONNECTED but the callback function registered in pm_register is not executed. When examining the cause, it was found that the callback function was not called because "PM_PEER_DATA_ID_BONDING" data was not registered in the im_ble_evt_handler function.
What are the possible causes?

If there are examples of this, better for me,thanks.

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