Wireguard server leaks real IP to Google.

I have checked for over 3 hours, going through all the possible solutions.
Every leak test website, DNS leaks, WebRTC leaks, etc. there is nothing, tests show no leaks,
I am 100% certain my server and Wireguard install using this script leaks the real IP to Google,

First I thought it is the client:
I tested with:
1. AllowedIPs = 0.0.0.0/1, ::/1
and
2. AllowedIPs = 0.0.0.0/0, ::/0

Using the first one, Google, sees the real client IP, and
using the second one Google, sees the real IP and server IP.
(when you delete cookies, Google shows captcha, and IP addresses)

On the client side, I tried connecting with Surfshark wireguard config, using the same DNS and AllowedIPs and didn't change any settings, Google sees server IP only.

I tried installing a new server using this script adding NextDNS instead of 1.1.1.1, it didn't work.

My client doesn't have IPv6.

Conclusion, there is something in the server, leaking the actual IP to Google.