Hmmm, that's interesting. I thought the issue was isolated to BaseUS. Their support is really non-existent. They reply but it's like you're talking to a stupid person that does not understand the issue.
Aside from this issue, do you have any other issues when using both ports? As for me, when I charge my phone while my laptop is plugged in, it sometimes drops the wattage on the laptop device to just 19w. If the laptop is plugged in by itself, it goes up to 59w. Not sure what's going on here.
Are there any usb c car chargers that support sfc 2.0?
Satechi - USB / USB C car charger with 72W:
Simultaneous Charging: Has both a universal USB A port and a Type-C port
Quick Charge: Devices can be charged quickly on the go
Powerful and compact design: Type-C power 60W (max), Type-A power 12W (max), total 72W
Equipped with an LED indicator to check the charging status
With Power Delivery for particularly fast charging
Compatible with almost all USB devices and most USB Type-C devices
The Satechi USB C and USB A Car Charger is the perfect solution for charging your devices on the go. Never worry about how to charge your smartphone, tablet, computer or other device while on the go. Simply connect the charger to your car's cigarette lighter and connect the other end of the USB cable to the USB port of the desired device. You can already charge your device on the go. Satechi's Dual Car Charger allows you to simultaneously charge a 13" MacBook Pro (2016) via the USB-C port and an iPhone/tablet via the USB-A port. The output power for the USB-C port is 60 W (max) and 12 W for the USB-A port.
ATTENTION: The delivery does not include a USB cable!
Weight: about 34g
Input: DC12V - 24V
USB-C output: 60W (max)
USB A output: 12W (max)
Total Power: 72W
Baseus aluminum 45W USB / USB C car charger:
Charges up to 4 times faster than conventional USB/USB C adapters
Extremely small and light (ideal for travelling)
With support for Power Delivery 3.0 / Quick Charge 4.0
45W output current power
With LED display on the charger
Charge your USB / USB C compatible devices such as smartphones, tablets or MP3 players, etc. in the car now. With the Baseus USB / USB C car charger, your devices are always fully charged while driving. The Baseus Car Charger Auto USB / USB C is ideal for people with active lifestyles who travel a lot. It simply plugs into your vehicle's power outlet (cigarette lighter) and charges while driving.
The power supply also supports the latest Power Delivery 3.0 and Quick Charge 4.0 technologies, with which you can charge your iPhone X up to 50% in just 30 minutes. The car charger always guarantees the maximum charging capacity to charge your electronic devices, with a current output line of up to 6 amps.
ATTENTION: USB/USB C cable not included (can be ordered in store).
The black color
Performance/power: 45 watts
USB Output: 4.5V/5A; 5V/4.5A; 9V/3A; 12V/3A; 20V/2.25A
USB-C Output: 5V/3A; 9V/3A; 12V/3A; 15V/3A; 20V/2.25A
Output USB + USB C Total: 5V/6A max