No internet from client

I have Netbird Self-Hosted running on a VPS1.
The clients connect and can reach each other.
An exit node with a route to my home network is also configured, so the devices can access the home network.
However, when the devices are connected to Netbird, I can no longer access the VPS2 via IP (Proxmox backup server), but only via Netbird’s IP. Then I realized that the VPS2 also has no internet connection (ping google.at, for example, doesn’t work).
I configured Cloudflare as the DNS server in Netbird.

What is the error that 1. I can no longer access the internet from the client, and 2. the VPS2 is no longer reachable via IP (neither via browser IP nor via SSH, i.e., a ping to the VPS2 fails).