Hi Stephan,
We regret for the delay in replying your query. This is a known issue with Chart Control and we have already reported this to our developers and our Developers are working with high priority on this issue. I will get back to you regarding the time frame for fixing this issue once we get update from our Developers.
Please refer to the following link for the status update on this defect fix.
Defect #10391 - Temporary chart image is created when print option is selected.Please let me know if you need any other information. Thanks for your patience.
Regards,
Manohari.R