Cloudflare and NGINX Proxy forwarding

Hello, I currently have the problem that if I use the A record with my IP for my Domain everything works if its not also proxied with nginx but as soon as I also proxy to another service like a nodejs Webserver or so the connection timeouts. The weird thing is if I use Cloudflare Tunnel it works then. Does someone know why this weird error happnes?

There are not errors or connections logged everywhere.
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