Unexpected Smart Reference Editor Behavior

I did the first section of Markus's tutorial using MPS 2.0 EAP and came across a minor problem.  

I'm not sure if I missed something, but the editor allows me to create an abstract concept if I create an "Entity," then hit control-space and select the only completion (EntityAttribute.)  

I thought that smart references shouldn't allow this.  I verified the cardinality of EntityAttribute is set to 1.  

Is this an MPS bug?
1 comment
For others interested.. I heard this is likely a bug and that users are best sticking to 1.5 until 2.0 stabilizes.

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