usb2-e1000 usb ethernet adapter amber led stays lit even when nothing is connected

I have the USB2-E1000 in some systems running Linux. Some of these systems have the amber LED lit no matter if it’s connected to anything or not. Other systems no LEDs lit until they’re connected to a switch/ethernet connection. My question is whether the ones with the amber LED constantly lit from power on, are defective or not?

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