New connection appears after unplugging Ethernet

[Martin <debacle debian org>]

Dears,

when I *unplug* the Ethernet of my laptop computer, a new connection
"enp0s25" appears out of the nothing. When I plug the Ethernet in again,
my usual connection "Wired" is automatically used, probably because the
other connection "enp0s25" is active?

Before unplugging:

NAME         UUID  TYPE      DEVICE  
Wired        6...  ethernet  enp0s25 

After unplugging:

$ nmcli con
NAME         UUID  TYPE      DEVICE
enp0s25      c...  ethernet  enp0s25
Wired        6...  ethernet  --

Maybe relevant software versions (Debian testing):

linux-image-5.16.0-6-amd64 5.16.18-1
network-manager            1.36.4-2
udev                       250.4-1

How can I prevent a new Ethernet connection on *unplugging* Ethernet?
Thanks in advance!

Cheers