If the latter, does that prevent exit through a barrier at the destination station?The staff member has the option to either record a virtual “clip”, record nothing, or mark the ticket as no further use possible.
It shouldn't usually. If the person on train clips it then their device is usually set to the train they are operating. If the person scanning the ticket is at a station where your journey ends then the gate or person who has scanned the ticket is effectively marking it as completed and it won't be accepted by another ticket gate.
That’s true. The reason I asked this question is because of my personal experience. I have a return e-tickets and I knew I’ve already used it and both tickets were scanned by train inspector. But out of curiosity I contacted the train company(via chat) and asked if the return ticket is still valid (not yet used). They asked for the screen shot of the qr code and the email I used in their app. And to my surprise the return ticket is not yet used according to the customer agent. I also asked if e-tickets get clip when scanned by inspector and the answer was yes. According to the agent, at the moment there is no way for customer to know if e-tickets were already used.Another concern I have about it is that you can’t see what was recorded.