The problem is charger compatibility. Looks like Nothing OS 4 is too conservative and strict.
Chargers Iāve used:
Redmagic 100w (from my 10Pro) - it constantly fluctuates but the charging wattage goes to 50-60w. But since it fluctuates, I stopped using it. Maybe too strong for the asking wattage of NP3.
UGreen 65w Nexode PD GaN - goes to 40-50w without anything else charging alongside it. (This charger has 3 Type C and 1 Type A port).
UGreen 65w GaN - only goes to 30-35w max by itself. (This has 2 Type C and 1 Type A port).
Lenovo 68w (from my Legion y700) - this is the perfect one for the NP3. Goes to 58- 65w actively and consistently.
We just have to test which one is perfect. I havenāt tried the CMF 65w so I cannot vouch for it.
So try Lenovo/Motorola charger for peace of mind.
