Ingress preview/stable host routes

[Desolar1um]

Hi everyone,
I'll preface first that I'm not sure if this is an issue or not hence posting here. This concerns the following documentation page concerning settings up an ingress with separate hosts for preview, stable, and split traffic respectively. I'm using Nginx ingress controller.

So far I've been implementing canary using only 2 hosts on my Ingress:

1. Main host (where traffic splitting also occurs)
2. Canary host

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: test-api
  labels:
    app: test-api
spec:
  ingressClassName: ingress-test
  rules:
    - host: test-api.com
      http:
        paths:
          - backend:
              service:
                name: test-api
                port:
                  number: 9080
            path: /actuator
            pathType: Prefix
          - backend:
              service:
                name: test-api
                port:
                  number: 80
            path: /
            pathType: Prefix
    - host: test-api-canary.com
      http:
        paths:
          - backend:
              service:
                name: test-api-canary
                port:
                  number: 9080
            path: /actuator
            pathType: Prefix
          - backend:
              service:
                name: test-api-canary
                port:
                  number: 80
            path: /
            pathType: Prefix

This allows me to set up a direct path to the Canary, but I noticed today that 0 traffic is routed towards the canary during traffic routing steps in my canary. All requests to test-api.com only go to the stable version. I realized the issue is the test-api-canary.com rule on my ingress. After deleting it, the traffic routing respects what is represented in canary steps.

Now, I'm looking at this ingress setup , and I don't understand how the traffic routing will take place for guestbook-root service. Will all requests that dont match the first 2 rules go to guestbook-root service regardless of host? as a sort of default backend? because that doesn't work for me, I need requests only for test-api.com to go through for the root service, and to have a separate route for desired i.e canary service.

I feel like some more information is needed on this page to make it fool-proof.
Thanks in advance