I have seen this still in NOS 3.0 Stable.
I have a PD 3.0 PPS charger. The first time I plug it in to charge it tops out at 10W. Then I must unplug and replug and it’s 25-28W.
Annoying but not impossible.
Also, it seems that the screen need to be on, for the high W PPS-enabled mode to function.
Again, annoying bug what do I expect for £169.
🤷🤷🤷🤷🤷🤷🤷🤷🤷🤷🤷