07-25-2016 05:32 AM
07-27-2016 04:23 AM - edited 07-27-2016 04:24 AM
We are aware of this. It is actually the current expected behaviour. Any system fields will have their default primary status restored as part of the schema update script.
I'm not sure on the technical limitations of why this happens. I would suggest posting any feedback or suggestions you have for this process as a feature request in the Share Your Ideas board.