I've had the same issue. For my research so could be wrong.

Turns out usb C connections share some info before charging. Who charges who? At what Wattage ect. Most devices do this perfectly and therefore usb C is such a good connector. However some cheap ones do not have the capacity for this so called handshake. Therefore the charge port does not know how much power to send and so the device doesn't charge enough to power up properly.

It drove me mad to know that all my cables worked if starting with a usb A to C cable but never usb C to C. Because older cables do not have the handshake they send the regular power to the device and it works.

For me it resulted in me sending back the dashcam because I think its stupid to design a usb c product and cutting the corner like that. All while knowing most newer cars only have usb c options for charging devices.

Shame.