SD card and USB key connection when user is logged off

Yes I have to admit: I am a switcher.
There is a thing I don't understand and I don't know if it is a feature or a bug.
I have implemented the screensaver to ask me the password after some time. So I have noted that when the Mac is in this state, if I connect an SD card or a USB key, these pheriperals are not connected. If instead I logon and I reconnect them they work.
Is it a feature or a bug?
I hope I have explained well the problem

It's a feature. USB drives must be unmounted or ejected before they are disconnected, to prevent volume corruption and data loss. The feature prevents users from getting into the situation where they accidentally plug a drive into the wrong computer, and then can't unlock the screen to safely unmount the drive before disconnecting it.
That's my guess, anyway.

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