Currently, old password is present in QR code even if the wi-fi network does not require encryption.
The following scenario is possible. You temporarily switch off the encryption for the previously encrypted network, generate a QR code, allow a new device to connect to the network and when everything is done, switch the encryption back on again. The new device can still connect to your network.
Currently, old password is present in QR code even if the wi-fi network does not require encryption.
The following scenario is possible. You temporarily switch off the encryption for the previously encrypted network, generate a QR code, allow a new device to connect to the network and when everything is done, switch the encryption back on again. The new device can still connect to your network.
That's not good.