Question regarding local.encoding property be after loading file?

I have a file that contains a not sign, Unicode U+00AC, which I've loaded on a RHEL 7.8 system using the RTC 6.0.6.1 scm load command.  The not sign is encoded as 0xac in Cp1252 and 0xc2ac in UTF-8.  After the file is loaded, the scm show properties command gives:

  jazz.encoding       - Cp1252
  jazz.executable     - false
  jazz.line-delimiter - Platform
  jazz.mime           - text/plain
  jazz.read-access    - Component scoped
  local.encoding      - UTF-8

The not sign in the loaded file is encoded as 0xac, which implies that loaded file is is Cp1252 encoded.  So why is the file's local.encoding property value UTF-8 rather than Cp1252?  Isn't this going to cause problems when the file is modified and the change checked in / delivered?