Our question is that iOS won't reconnect the slave device after the BLE is disconnected, we want to know why？

To clarify, the "remove" messages we are observing are not triggered by the user manually clearing notifications from the Notification Center. Additionally, when notifications are no longer being pushed, the ANCS service remains active, and our accessory is still connected. Notably, incoming call notifications are still being received during this period, but standard notifications (e.g., messages or app alerts) stop arriving.