Comment 134 for bug 1624317

Edit: I should add, that this works ONLY if ipv4.dns-priority is set to be negative in the config file in .../etc/NetworkManager/system-connections/<con-name> such that it contains something like:
[ipv4]
dns-priority=-42
dns-search=
method=auto

When I properly placed "[main] dns=systemd-resolved" in the ../etc/NetworkManager/NetworkManager.conf file (I actually didn't have systemd-resolved properly configured as the dns-manager when I manually installed the NM git master with your patches applied), this is the (correct) output of systemd-resolved --status:

noctua@corinth:~$ systemd-resolve --status
Global
          DNSSEC NTA: 10.in-addr.arpa
                      16.172.in-addr.arpa
                      168.192.in-addr.arpa
                      17.172.in-addr.arpa
                      18.172.in-addr.arpa
                      19.172.in-addr.arpa
                      20.172.in-addr.arpa
                      21.172.in-addr.arpa
                      22.172.in-addr.arpa
                      23.172.in-addr.arpa
                      24.172.in-addr.arpa
                      25.172.in-addr.arpa
                      26.172.in-addr.arpa
                      27.172.in-addr.arpa
                      28.172.in-addr.arpa
                      29.172.in-addr.arpa
                      30.172.in-addr.arpa
                      31.172.in-addr.arpa
                      corp
                      d.f.ip6.arpa
                      home
                      internal
                      intranet
                      lan
                      local
                      private
                      test

Link 5 (tun0)
      Current Scopes: DNS
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
         DNS Servers: 209.222.18.222
                      209.222.18.218

Link 2 (wlo1)
      Current Scopes: LLMNR/IPv4 LLMNR/IPv6
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no

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So it works! It would be amazing if you could get this fix backported successfully for the Ubuntu folks, I haven't had much luck. Thank you so much!