April 2023
The restoration was rolled out some time back, but some players had progressed past that point already, so there was no way to restore them without rolling them back.
This thread had been left up as there's a persistent issue where players could appear to be reset (they actually weren't) but now it's getting conflated with the real issues around what seem to be incorrect split deranks.
The thread for that is here, we'll close this down so as to reduce confusion around the issue.
To reiterate, if you get a massive RP loss in a single match that brings you to zero RP< that's a visual bug and the RP will return the next time you earn RP.