OpenVpn does not open blocked sites, the reason?

Question

openvpn

Hello! The situation is as follows: the latest openvpn (2.3.10-lubuntu2) is installed on vps (kvm) ubuntu 16.04, OpenVPN 2.4.2 is installed on the windows 10 client, "block-outside-dns" is set in the .conf file for clients, after that DNS leak test does not display dns of my provider (only dns openvpn) but blocked sites (vk, mail, yandex) are not displayed (information about blocking from the provider). I thought it was a DNS leak Features of the DNS resolver in Windows 10 and DNS Leak in another, since the latest OpenVPN 2.4.2 fixed this and I specified the "block-outside-dns" parameter. What could be the reason?
PS it was in the cache, "block-outside-dns" works