Binding Data Codec: Incorrectly deserialized unkeyed list from NormalizedNode

The following yang syntax is accepted and generates Java files, but when I attempt to process a data change (onDataChange implementation) the generated AsyncDataChangeEvent is unusable. The object reference is non-null, but attempting to use the toString() method of the object causes an error:

list foo {
list bar {
key “type”;
leaf type

}
}