ingress v1beta1 to v1 - application fails

Question

I am trying to "convert" my ingress files from v1beta1 to v1. Most of them works just fine, but I am facing a problem with one application(guacamole) and I can not figure it out why.

This is the working ingress ( v1beta1 )

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: guacamole
spec:
  rules:
  - host: guacamole.mydomain 
    http:
      paths:
      - backend:
          serviceName: guacamole
          servicePort: 8080

And this is the one it is failing:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: guacamole 
spec:
  rules:
    - host: guacamole.mydomain 
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: guacamole
                port: 
                  number: 8080

By failing I mean that I can correctly get to the application main page, but it gives me an error page. Internally the application redirects to https://guacamole.mydomain/guacamole/#/ so maybe the pathType in the ingress is wrong.

Any ideas will be really healpful.

Thanks!