DNS leaks or can not make phone calls

So, after being on v0.5.5u (fdroid\) for a long time i thought it was a time for an update.

My setup is being on mullvad vpn and DNS alongside hagezi blocklists.

After update, with the same setup, i get leaks. Ip is from mullvad servers but DNS from ISP.

After some expiriment with the settings these dns leaks go away while enabling lockdown mode on rethink app.Always on is active always in both rethink app and android.

While in lockdown mode i can not make calls nor i can recieve any. This happens only in my work in some tunnel like area. But i did not have this problem before.

Any thoughts?