salt.states.file.copy bug?

this_works_without_issues:
  module.run:
    - name: cp.get_file
    - path: salt://windows/installers/AddAccountToLogonAsService.ps1
    - dest: C:\AddAccountToLogonAsService.ps1

this_will_fail:
   file.copy:
     - source: salt://windows/installers/AddAccountToLogonAsService.ps1
     - name: C:\AddAccountToLogonAsService.ps1

Error message:
          ID: this_will_fail
    Function: file.copy
        Name: C:\AddAccountToLogonAsService.ps1
      Result: False
     Comment: Source file "salt://windows/installers/AddAccountToLogonAsService.ps1" is not present
     Started: 08:13:23.242000
    Duration: 0.0 ms
     Changes: