Deleting locked templates bug?

All right, so I am a member of 2 groups, Provisioning Development and my team. We keep our dev / testing templates in the Provisioning Development group, and the public templates that our techs use to deploy in Public. I have recently converted all public templates to locked templates.

Directory structure as such:

• Provisioning templates
  • My templates
  • Provisioning Development templates
    • Included Templates
    • Standalones
    • Windows 10
      • Win10x64 Enterprise CBB – SSC- Dev
      • Win10x64 Enterprise CBB – Standard- Dev
      • Win10x64 Enterprise LTSB – Production- Dev
    • Windows 7
    • Windows 8.1
    • All team templates
  • Public
    • Windows 10
      • Win10x64 Enterprise CBB – SSC
      • Win10x64 Enterprise CBB – Standard
      • Win10x64 Enterprise LTSB – Production
    • Windows 7
    • Windows 8.1
    • All public templates

Notice the difference between the names is the dev templates contain “- Dev” in the title.

So when I have to update a template, I create a locked version of the Dev template, delete the Public version out of Public → All public templates, and move the locked template over to Public → Windows 10.

However, when I attempt to rename the locked template to remove the “- Dev” out of the title, I get the error message:

I can find no reference to the template that supposedly already exists. Any ideas? Bug perhaps?