404 on a parametered route in ASP.NET Core 8 Web API with K8s Ingress

I'm sorry if I might be using a different term, but I don't really know what terms should I use, that's why I'm having a hard time to search this over search engines.

Anyway, I have an ASP.NET Core 8.0 Web API and I used a Route attribute on the HTTP GET method of my FileController. The URL format is something like this when debugging on local:

http://localhost:8080/api/file/{appId}/{key}

It is working properly.

But through the Kubernetes ingress, I'm getting a 404 error if I try to access it with this url:

https://example.com/serviceapi/myservice/api/file/{appId}/{key}

All the other Web API endpoints are working properly - just not this one.

Here's the YAML of the ingress:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: myservice.ingress
  namespace: myservice
  annotations:
    nginx.org/mergeable-ingress-type: "minion"
    nginx.org/rewrites: "serviceName=myservice-webapi rewrite=/"
spec:
  ingressClassName: nginx
  rules:
  - host: example.com
    http:
      paths:
      - path: /serviceapi/myservice/
         pathType: Prefix
         backend:
           service:
             name: myservice-webapi
             port:
               number: 80

When we use nginx.org, we can use ImplementationSpecific for url rewrite.

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: myservice-ingress
  namespace: myservice
  annotations:
    nginx.org/mergeable-ingress-type: "minion"
    nginx.org/rewrites: "serviceName=myservice-webapi rewrite=/$2 break"
spec:
  ingressClassName: nginx
  rules:
  - host: example.com
    http:
      paths:
      - path: /serviceapi/myservice(/|/.*)
        pathType: ImplementationSpecific
        backend:
          service:
            name: myservice-webapi
            port:
              number: 80