My application went through the same change yesterday for background check. The status of the application on login displayed as 'application/profile updated' is the ghost update.
From the recent trends which I have observed on myimmitracker, the processing times of some visa offices are higher compared to others. For instance, Ottawa compared to Sydney. So will be mentally prepared to wait after knowing the visa office :)
Stream - FSW Outland
AOR - 12 Dec | Medicals passed - 31 Dec | Biometrics - Jan 8 | BG Status - We are processing your background check. We will send you a message if we need more information.
Submitted the web form to check the Visa Office an got a revert that application is with the CIO...
It is based on the elapsed time. As your AOR date was in december 2019 and the CIC processing time is approximately 6 months i.e. June 2020. Hence it shows the 20%. Mine shows the same, AOR 12 Dec.