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 Interesting how do you measure if it passed or not? I tested Proton and Nym, and both didn't leak my IP or DNS. The only thing I thought strange was on the test with Nym, it shows USA as IP while the first hop is on Germany and the second is on Canada, and I'm not on the USA either. 🤔  
 Every test I ran failed the following:

If you are connected to a VPN service and ANY of the servers listed above are not provided by the VPN service then you have a DNS leak and are choosing to trust the owners of the above servers with your private data.



 
 IVPN, Mullvad and Proton pass with flying colors 
 Thanks for the heads up. I also tested with Invisible Pro, and no leaks, although all of them behave differently when the private DNS is on. Even Nym couldn't leak it. But I'm uninstalling it right now. 
 Damn now I got it, I was using a private DNS to block ads I turned it off and bang it leaked  my ip with Nym but not with Proton 🤙 
 Yes, a private DNS is useful in some circumstances, but bear in mind, it is another vector of data sharing, you need to trust that DNS service, they have your IP (one more party) and the log of the sites you are visiting, after all, that is their function, to resolve the sites addresses. Proton VPN, Mullvad and IVPN all have their own secure DNS which filters ads and malware, by using those VPNs with their default DNS setting you have more cyber sec, removing one vector of data sharing