spring-data-couchbase: MappingCouchbaseConverter.read() is not recursive

Using Cluster.query() I’m parsing the result into classes that have child object. A quick exemple to visualise :

@Data
public class A {
    String someProp;
    SubA nestedObject;

    @Data
    public static SubA() {
        String someNestedProp;
    }
}

Doing converter.read(A.class, document) leads to nestedObject being a HashMap<String, String> instead of a SubA as anyone would expect. Am I doing this wrong or are my expectations correct ?