The Chart3DControl.AspectRatio property value has been changed from an empty value (0, 0, 0) to Size (1,1,1). Empty values indicate that the length ratio of chart axes is calculated based on the underlying chart data. Since v20.1.4, axis lengths are proportionally equal.
To restore the old behavior (automatic ratio calculation), assign a Size object with zero values to the Chart3DControl.AspectRatio property:
XAML<dxc:Chart3DControl AspectRatio="0 0 0">
C#Chart.AspectRatio = new Size();
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