I just bought a used Pixel 3 in excellent condition without the charger. So decided to buy a 20W PD supported third-party charger to utilize the fast charging function on the phone. The charger seemed to work since my phone displayed "Charging Rapidly" message on screen.
By using AccuBattery app, I found that my phone only charged for 1 Ampere on the average during off screen.
I don’t think the charger at fault since my brother’s Galaxy A50s managed to charged up to 2 Ampere while using the same charger.
Is there a way to fix this?