[Pkg-utopia-maintainers] Bug#972688: 1.27.91-1 blows away existing dns nameservers when VPN activates

[dann frazier]

Package: network-manager
Version: 1.27.90-3
Severity: normal

After upgrading to 1.27.91-1, I've found that connecting to my VPN causes
my existing "nameserver" option to disappear from /etc/resolv.conf.

Before connecting:
----
# Generated by NetworkManager
nameserver 192.168.1.1
----

After connecting (actual search domains obfuscated):
----
# Generated by NetworkManager
search foo bar baz
----

I've downgraded back to version 1.27.90-3 which restores the desired behavior
of retaining the existing nameserver setting:
----
# Generated by NetworkManager
search foo bar baz
nameserver 192.168.1.1
----

Note that I have the VPN's "DNS / Automatic" toggle disabled.

-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.9.0-1-amd64 (SMP w/4 CPU threads)
Kernel taint flags: TAINT_FIRMWARE_WORKAROUND
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages network-manager depends on:
ii  adduser          3.118
ii  dbus             1.12.20-1
ii  libaudit1        1:2.8.5-3.1
ii  libbluetooth3    5.55-1
ii  libc6            2.31-4
ii  libcurl3-gnutls  7.72.0-1
ii  libglib2.0-0     2.66.1-2
ii  libgnutls30      3.6.15-4
ii  libjansson4      2.13.1-1
ii  libmm-glib0      1.14.6-0.1
ii  libndp0          1.6-1+b1
ii  libnewt0.52      0.52.21-4+b2
ii  libnm0           1.27.90-3
ii  libpam-systemd   246.6-2
ii  libpsl5          0.21.0-1.1
ii  libreadline8     8.0-4
ii  libselinux1      3.1-2+b1
ii  libsystemd0      246.6-2
ii  libteamdctl0     1.31-1
ii  libudev1         246.6-2
ii  libuuid1         2.36-3+b1
ii  policykit-1      0.105-29
ii  udev             246.6-2
ii  wpasupplicant    2:2.9.0-15

Versions of packages network-manager recommends:
ii  crda                         4.14+git20191112.9856751-1
ii  dnsmasq-base [dnsmasq-base]  2.82-1
ii  iptables                     1.8.5-3
ii  modemmanager                 1.14.6-0.1
ii  ppp                          2.4.7-2+4.1+deb10u1+b1

Versions of packages network-manager suggests:
ii  isc-dhcp-client  4.4.1-2.1+b2
pn  libteam-utils    <none>

-- no debconf information