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The core troubleshooting steps  brought Don to a right decision were identifying the name of internal interface within corresponding qdhcp namespace and  capturing packages on internal qdhcp interface tap07519b2e-d6 =>
$ sudo ip netns exec qdhcp-bcb826f9-545a-4d32-ba94-8f9fb71054bc ifconfig
$ sudo ip netns exec qdhcp-bcb826f9-545a-4d32-ba94-8f9fb71054bc tcpdump -ln -i tap07519b2e-d6 
It did provide him information, that dnsmasq daemon  was providing DHCP replays  (ACKs ) to  guest VM, however replays were not accepted by guest due to incorrect br-int configuration.