Not sure if anyone else has run into this, maybe it’s been there forever and I just ran into it.
There is a USB to PC setting enabled by default which when you active sync a device, the device will grab the Proxy setting off your PC and will remain there once uncradled. Attached is a reg key to disable this feature which is enabled by default.
Use the flowing registry key to uncheck/ disable the advanced USB setting
"DefaultClientDriver" = "Serial_Class"