Custom user data in JME scene composer

I have defined a bundle I want to add as custom user data to various entities in a scene. I want to do this in the JME scene composer. Although I can execute this operation, for some reason, after I fill in the bundle fields and hit OK, the data I’ve entered in the for will not b persisted… I’ve implemented the savable interface!

Any ideas what might go wrong?

I noticed something similar with this component, I’ll investigate