When I connect my LineageOS 16 (Android 9) device to my computer, USB debugging turns on by default. Even when locked. That doesn't seem safe, so I searched through my settings to change that. I turned off 'Android debugging' and revoked USB debugging authorizations, which seemed to be the end of it. But then I rebooted and the 'Tap to turn off USB debugging' notification comes on again immediately after reconnecting!
How do I disable USB debugging by default?