Detailed Logs:

Before the test:
dnsmasq.log is identical
dnsmasq-vpn.log as well, except the version number

Good Case:
ubuntu@autopkgtest:~$ resolvectl query math.lab
math.lab: 10.241.3.3                           -- link: testvpnrouter
-- Information acquired via protocol DNS in 20.8ms.
-- Data is authenticated: no; Data was acquired via local or encrypted 
transport: no
-- Data from: network

Bad Case:
ubuntu@autopkgtest:~$ resolvectl query math.lab
math.lab: resolve call failed: Connection timed out

After the test:
- dnsmasq.log is still identical
- dnsmasq-vpn.log is quite different

Entries in Good case:
Jan 11 11:54:18 dnsmasq[7952]: query[A] math.lab from 10.241.3.1
Jan 11 11:54:18 dnsmasq[7952]: config math.lab is 10.241.3.3
Jan 11 11:54:18 dnsmasq[7952]: query[AAAA] math.lab from 10.241.3.1
Jan 11 11:54:18 dnsmasq[7952]: config math.lab is NODATA-IPv6

Entries in Bad case:
Jan 11 11:54:16 dnsmasq[8871]: query[A] math.lab from 10.241.3.1
Jan 11 11:54:16 dnsmasq[8871]: config math.lab is 10.241.3.3
Jan 11 11:54:16 dnsmasq[8871]: query[AAAA] math.lab from 10.241.3.1
Jan 11 11:54:16 dnsmasq[8871]: forwarded math.lab to 127.0.0.53
Jan 11 11:54:16 dnsmasq[8871]: query[AAAA] math.lab from 10.241.3.1
Jan 11 11:54:16 dnsmasq[8871]: forwarded math.lab to 127.0.0.53
... the last two lines repeat until a timeout occurs

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https://bugs.launchpad.net/bugs/1957086

Title:
  Autopkgtest systemd fail against dnsmasq 2.86 (22.04)

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