Ok, I will investigate further.
I thought it is because the Quiz setting Timing > When time expires = "Attempts must be submitted before time expires, or they are not counted". With this setting for the User A the answers will be auto-submitted, but for the User B they will not be. The default setting for this option is more logical, "Open attempts are submitted automatically". I think that with this setting all timed-out attempts are auto-submitted, and just the other option creates the perceived inconsistency. But as I said, I will have to investigate further + maybe test with the latest version too as we are on 3.5.
I thought it is because the Quiz setting Timing > When time expires = "Attempts must be submitted before time expires, or they are not counted". With this setting for the User A the answers will be auto-submitted, but for the User B they will not be. The default setting for this option is more logical, "Open attempts are submitted automatically". I think that with this setting all timed-out attempts are auto-submitted, and just the other option creates the perceived inconsistency. But as I said, I will have to investigate further + maybe test with the latest version too as we are on 3.5.