Situation:
The component exists with a DateField in its dialog. But the field value is empty (for example a new added field or never chosen a date to store). So there exists no correlating property.

Result:
The method info.magnolia.ui.form.field.factory.DateFieldFactory.getConfiguredDefaultValue() is never called.

Reason:
In the method
{{info.magnolia.ui.form.field.factory.AbstractFieldFactory.setPropertyDataSourceAndDefaultValue(Property)}
the boolean expression ((ItemAdapter) item).isNew() is returning false.