NFC tag is in range. The state automatically changes to this when the state was previous value 3, without using any NFC service commands.
NFC tag is now out of range, where the NFC tag was previously in range. This occurs automatically without using any NFC service commands. Once this state is entered, it won't automatically change to anything else when the tag is moved in range again. Hence, if you want to keep doing tag scanning after this, you must stop+start scanning.