I’m using IOS and a local server.
I am able to scan a cloned project QR code successfully until the project gets large enough to trigger an error which states “Server is not reachable.” If I then delete a few components, the QR code scans fine.
Note: The QR code for the cloned project gets progressively mode complicated until it become much simpler again - this is the point when the scan fails on the project.
I’ve also reproduced on the main Blynk server by creating a project and adding widgets until it fails to scan a cloned project.
Error screen shot: