On my "Retain Platinum One" page, it now states that my SC balance is zero and that I still need 3,600 more SCs to retain, but weirdly "only" 2,680 more on QF marketed flights (instead of 2,700, which is what would be required if my balance really was 0).
In reality, I flew a rtn MEL-SYD trip recently on a standard paid fare, and earned 20 SCs for that, which have correctly posted to my account. So the fact that I need 2,680 more on QF marketed flights is correct, but the other figures are wrong.
In the app it shows my total SC balance as 140 (I can't even remember where the other 120 came from - but quite possible they don't count for P1 renewal). In any case I certainly won't be meeting the standard P1 retention criteria this year, so I'm not really worried about it!