Hi Christian,
Thank you for reaching out.
It is a known bug that the attendees CSV export does not include that additional data. It is something we are actively working on, but I unfortunately do not know how soon a fix for this will arrive. 🙁
The timeline is likely something in the range of several weeks or even beyond…so making your own extraction method might indeed be a good idea here. Hopefully you don’t have to use it for long! But I just wanted to be honest that it will likely take long enough for us to truly fix this that proceeding with your own solution in the interim is not a bad idea.
Sorry to disappoint!
George