Hi, I did not install/modify anything before the test (I restored to factory settings to be sure).
The openvpn servers are 1) a Mango I own in another country 2) a paid openvpn provider with servers in EU/US/Asia. Both of them working ok with Flint and a pc client.
I can provide any log/detail to narrow down the problem.
Not sure if I am the unique beta tester with that issue, or perhaps they enabled AdGuard and they did not find the issue. To replicate the issue default dns config must be present (AdGuard off and DNS to automatic).