From what I'm reading on rightsnet, many claimants have been contacted directly by the DWP and offered a lower award, as long as they abandon their appeal. They are given a few days to consider it, and, if they say no, then the lower rate isn’t awarded and the case continues to tribunal.
Some advisors have told clients to accept the lower award offered by the DWP. As someone explained on rightsnet, BY very carefully not saying they'd abandon their appeal, they took the offer, and then asked for a MR for a higher award. It's under pip negotiating/bargaining to avoid tribunal on the rightsnet forum.