Oggyo Yes, Tailscale is very similar.
I just tried setting the Private DNS to off instead of auto and I seem to be getting the same behavior.
1) If I have wifi off and my mobile data is the only data, I cannot reach a regular website from the web browser while Netbird is connected. If I switch wifi on, then I can connect to both regular websites & my VPN connected services.
2) My Netbird VPN only shows 1 peer when I connect only over mobile data. If I connect to my local wifi, then all my peers are available.
3) I've tried connecting via wifi at another location but not all of my peers were available and it didn't appear that I could reach any regular websites. (My peers are distributed among several different locations).