Can you share a bit more information on your scenario? Some runnable code showing the chart's setup and exporting code would be helpful.
Also, keep in mind that the reported behavior could be observed if you try to export the chart when its hidden or not added in the visual tree. This happens because the labels are not generated until the chart becomes visible. In this case you can consider opening a new window with the chart and exporting it after this. Here is a small code example showing this approach. Can you please give it a try and let me know how it goes?
var chart =
chart.Width = 1000;
chart.Height = 600;
// some chart settings and populating with series and data here
var w =
w.WindowStyle = WindowStyle.None;
w.Height = 0;
w.Width = 0;
w.Content = chart;
w.Loaded += (s, e) =>
(Stream stream =
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