EnableNeo4jRepositories.sessionFactoryRef is ignored / does nothing - spring-data-neo4j

Question

I'm trying to configure a Spring Boot 1.5.9 project with multiple data sources, of which some are Neo4j.
The version of spring-data-neo4j I'm using is 4.2.9.
My goal is to use a different SessionFactory for different repositories, using a different Configuration class for each.
I've got this all working with Mongo but it seems that, even though the sessionFactoryRef is available on #EnableNeo4jRepositories, it simple does not get acted upon.
Abbreviated version of my configuration, with the general concepts:
#org.springframework.context.annotation.Configuration
#EnableNeo4jRepositories(basePackages = "<repo-package-name>", sessionFactoryRef = NEO4J_SESSIONFACTORY_NAME)
public class MyConfiguration {
protected static final String NEO4J_SESSIONFACTORY_NAME = "mySessionFactory";
#Bean(NEO4J_SESSIONFACTORY_NAME)
public SessionFactory mySessionFactory() {
SessionFactory sessionFactory = ...
// passing entity package corresponding to repository
return sessionFactory;
}
As mentioned, this construct works fine with spring-data-mongodb, however in neo4j it first starts out with an error:
***************************
APPLICATION FAILED TO START
***************************
Description:
A component required a bean named 'getSessionFactory' that could not be found.
Action:
Consider defining a bean named 'getSessionFactory' in your configuration.
Turning on debug in the logger and a look through the code led me to SessionBeanDefinitionRegistrarPostProcessor, that contains the following code to get the sessionFactory:
private static String getSessionFactoryBeanRef(ConfigurableListableBeanFactory beanFactory) {
return beanFactory.containsBeanDefinition("sessionFactory") ? "sessionFactory" : "getSessionFactory";
}
Hmmm... hardcoded names for a bean, no sign of customisability.
I then proceeded to name my bean twice, #Bean("sessionFactory", NEO4J_SESSIONFACTORY_NAME), so the above code would pass.
The application started, but the problem is that the repositories get wired with whatever bean is called sessionFactory, effectively not using the sessionFactoryRef on the annotation.
To test this, I changed the name on the annotation to a non-existing bean and it continued to start (if I do this with the mongo-annotation, the application quits because the bean mentioned in mongoTemplateRef isn't available).
I dug a little deeper and found that, for mongo, it retrieves the bean reference in this class. The equivalent neo4j implementation has no such thing. It could of course be an implementation detail but I wasn't able to find any reference to the sessionFactoryRef attribute other than the annotation and the xml-schema.
There are also other places in the config classes that expect only one SessionFactory to be available.
So, in short, it seems to me that EnableNeo4jRepositories.sessionFactoryRef has no implementation and therefore simple doesn't do anything.
As a result, with the current code a single bean "sessionFactory" must be present and all repositories will be wired with this bean, regardless of the value of sessionFactoryRef.
Anybody else with a similar experience or any idea how to file a bug for this?