The USB-C Standard explicitly forbids use of USB-anything to USB-C adapters. Buy a USB-C to USB-other cable instead of trying to light your computer on fire.
The reason it is forbidden is because using two adapters you can convert a USB-C cable into a USB-A to USB-A cable. USB-A ports are not required to handle exciting and unexpected voltage on the wrong pins.
The prohibition is only against USB-anything to USB-C socket. Adapters to USB-C plug are allowed (and can't create the invalid combination you just described).
Apart from fast charging or connecting monitors via USB etc.
The awesome thing about USB-C is all you need is a couple USB-A to USB-C adapters, which are cheap, and bam—all your devices are now compatible forward.
And if you already have a USB hub all you need is one adapter.