Call back URL not working any more

I was using this very good QR reader up to now, leveraging its x-callback feature to navigate from / back to another personal App (to open a specific page based on a value stored in the qr code).

Since the last update, this functionality seems to have disappeared and I shall have to find another one for QR code reading prototype Apps.

PemG about QR Code Reader by Scan, v1.7