proxyProtocol usage

I'm having problems in configuring proxyProtocol. I have HAproxy in front of K8S cluster with MetalLB (layer 2) and traefik ingressController exposed with LB on a fixed IP. Since I get the HAproxy Ip as the source I hoped that adding the send-proxy in HA and setting the proxyProtocol in traefik I could solve the problem, but my ingress breaks and I get error in accessing the usual echo server.
If I remove the HA proxy send-proxy all works (apart from the source IP being wrong) ... HA is configured in tcp
Any hint?

Hello, I tested it with send-proxy-v2 and I got same problem