Created attachment 7500 screenshot Plugged in 2 different android devices. When unplugged the sidebar entry remains, plug same device back in to get a new entry in the sidebar. These dead entries in sidebar are not cleared until a logout/in cycle.
A USB device (USB 2 or 3) attached and then unmounted and ejected removes itself from the sidebar.
It's a gvfs bug as described here: https://gitlab.gnome.org/GNOME/nautilus/issues/154 It'll be fixed in gvfs 1.35.2 and 1.34.2. More info: https://bugzilla.gnome.org/show_bug.cgi?id=789491