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Description of problem:

nmcli con del test11+ test12+
nmcli  connection add type veth con-name test11+ ifname test11 veth.peer test12 ip4 10.42.0.2
nmcli  connection add type veth con-name test12+ ifname test12 veth.peer test11 ip4 10.42.0.1
nmcli con up test12+
while ! nmcli -g GENERAL.STATE con show test11+ |grep activated; do :;sleep 1;done 
nmcli dev del test11

Error: Device '(null)' (/org/freedesktop/NetworkManager/Devices/16) deletion failed: Message recipient disconnected from message bus without replying
Error: not all devices deleted.

deleting a device should bring all affected connections down being it veth.peer or veth device directly.

Version-Release number of selected component (if applicable):
NetworkManager-1.30.0-0.5.el8.x86_64

NMCI test case added:
https://gitlab.freedesktop.org/NetworkManager/NetworkManager-ci/-/merge_requests/779

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: NetworkManager security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:4361