WFS GetFeature requests for features with multiple geometries with outputFormat "json" return JSON structures as in the following sample:
Problem: If the value of the default geometry of the feature type is null, another geometry of the feature is rendered as default geometry. However the geometry_name is still the name of the default geometry. So the geometry_name does not correspond to the default geometry of the JSON structure.
Additionally the a null value is rendered in the properties for the default geometry. This is inconsistent to behaviour shown on non-null values.