That's why my stupid flashlight won't charge on some chargers! Thank you, you've solved a mystery for me.
To add more detail, USB-PD (power delivery) is a complex negotiated protocol. The charger is supposed to output some meager 5v power supply like a traditional USB A supply, and the device asks for some specific voltage, and the charger tells the device if it can do that, and then does it (up to 24v, iirc). PD Chargers are supposed to support any of the supported voltages, but many (eg. Apple MacBook Chargers) only support a subset of the voltages.