Attribute extension form names are showing as GUID when you view them under data forms.
We are currently evaluating this issue and will update this article when we have more information.
Steps to Duplicate
1. Go to administration > Attribute category > Attribute Form Extensions’ tab > Add an attribute form extension using any Data forms 2. Go to Administration > Application > Features > under ‘New Features’ click on ‘New data forms’ > it shows GUID under name