Today in vendors slipping single bits (or single bit!) of information into weird places:
I am *completely* certain that Google once made a USB-C audio adapter that has a *different USB PID* depending on whether it has something plugged into it.
I am somewhat certain that it's 18d1:5025 with something plugged in, and 18d1:5029 without.
If anyone has this adapter and is interested in this useless research, please send screenshots lsusb or device manager for this. Thank you so much. I need this.