InfoTable property of a Thing created via extension has no DataShape attached

Dear devs,

I have just noticed that, by creating a Thing from a Template defined in the Composer using:

EntityServices.CreateThing(ThingName, null, null, TemplateName);

The Thing in created correctly, but there is a DataTable Property that has no DataShape associated with it:

But this doesn't happen if the Thing is created via Composer. 

What am I doing wrong?

Thanks