Both the veeam status and the veeam status advanced sensors return "wrong" values for status of backup copy jobs. For the veeam status sensor, backup copy jobs with warning or error in last result are not counted towards the total. The advanced sensor, if pointed to a backup copy job, always has the status "none"
After troubleshooting and finding out that the enterprise manager dashboard shows the same values, meaning it doesn't include backup copy jobs warings and failures in its dashboard statistics. The veeam sensor seems to grab this dashboard data, thus the sensor has those limitations. I contacted veeam support and have been told that this behaviour by the enterprise manager is by design.
Therefore I would like to suggest an improvement to the veeam prtg sensors, fixing this - in my mind - design flaw. The data is there, just the enterprise manager dashboard has what I would call a design flaw.
I'm about to write a custom sensor for the time being, and will update this post if I'm successfull.