Samsung has implemented a Proprietary Power Delivery Extension (PPDE) for fast wireless charging. These proprietary extensions are not fully compatible with the newer standardized Extended Power Profile (EPP).
I'm using a quadlock QI charger which is now not fast charging, I hoping Samsung roll out the firmwear update, otherwise I have a very expensive 'slow' charger!
Here's what Quadlock had to say on it;
Jordan (Quad Lock Support )
Mar 3, 2021, 17:47 GMT+11
Hi ther Paul