connection editor does not preserve ignore-auto-dns=true flag

I want to avoid using the DHCP server provided DNS. To achieve this, I tried using ignore-auto-dns=true flag in NM configuration. However, subsequent editing of the network configuration through the applet remove the flag. At the same time the applet does not allow me to specify this flag in any way.

The applet should either preserve flags it does not understand or it should know about this flag and let me edit it in the applet.

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: network-manager-gnome 1.24.0-1ubuntu1
ProcVersionSignature: Ubuntu 5.13.0-41.46-lowlatency 5.13.19
Uname: Linux 5.13.0-41-lowlatency x86_64
ApportVersion: 2.20.11-0ubuntu71.2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: XFCE
Date: Sat May 21 19:55:35 2022
ExecutablePath: /usr/bin/nm-connection-editor
IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2011-11-13 (3842 days ago)
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
IpRoute:
 default via 192.168.0.1 dev enp6s0 proto dhcp metric 100
 169.254.0.0/16 dev virbr0 scope link metric 1000 linkdown
 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown
 192.168.0.0/24 dev enp6s0 proto kernel scope link src 192.168.0.71 metric 100
 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown
RfKill:
 0: hci0: Bluetooth
  Soft blocked: no
  Hard blocked: no
SourcePackage: network-manager-applet
UpgradeStatus: Upgraded to impish on 2021-10-15 (218 days ago)
modified.conffile..etc.default.apport: [modified]
mtime.conffile..etc.default.apport: 2019-03-27T00:07:10.128435
nmcli-nm:
 RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN
 running 1.32.12 connected started full enabled enabled enabled enabled enabled