Field handle still using slug formatting

[skrolikowski]

Describe the issue

Field handle is still using slug formatting (dash vs underscore).

Screenshots

Version and browser

Version: Beta 6
Browser and version: Chrome (latest)

Bug report checklist

• I have filled out as much information as I can
• I have detailed how the issue can be reproduced
• I have searched for existing issues and to the best of my knowledge this is not a duplicate