[2020] Pet mysteriously disappearing from the server, permanently

Hey @Saradain

Welcome to our community and apologies for the frustration.
The error you mention is present in other logs where players haven’t encountered this issue and should not be related. Without any other additional info, we at least could suggest a workaround given that you might have admin access to your server. You could spawn from the admin menu a similar follower and level it up via the console command to at least replace the loss. If you come across the same issue, please report it back to us with as much additional information as you might have.
Thanks in advance.