pfSense and system-resolved as DNS client

[pszafer]

Hello,
..I've started using system-resolve as my DNS client and NetworkManager as DHCP client..
I have pfSense connected like this:

[Broadband router]  <-192.168.1.0/24 DMZ--> pfSense <---> LAN

In my parents house I have almost exact copy of above configuration.

[Broadband modem] <---- public IP ----> pfsense <----> LAN

In their house NetworkManager sends to system-resolved IPv6 config...

It looks like this:

Link 2 (wlp4s0)
      Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
         DNS Servers: 192.168.1.1
                      fe80::6666:b3ff:fe16:4b12
          DNS Domain: mydomain.com
                      ~lan

Proper 'pfSense' config

Link 2 (wlp4s0)
      Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
         DNS Servers: 192.168.4.99
          DNS Domain: mydomain.com

Any idea where can something be different that NetworkManager finds some ~lan network in their house....