Not setting modifiedQueryString still results in a rewrite rule that sets the query string to empty

Describe the bug We are using rewrite rules on ingress to rewrite paths but would like to preserve the query string. The AppGW ingress controller updates the rewrite rule to update both URL and query string always.

To Reproduce

apiVersion: appgw.ingress.azure.io/v1beta1
kind: AzureApplicationGatewayRewrite
metadata:
  name: test
  namespace: dev
spec:
  rewriteRules:
    - actions:
        urlConfiguration:
          modifiedPath: /api/v{var_uri_path_1}/{var_uri_path_2}
          reroute: false
      conditions:
        - ignoreCase: false
          negate: false
          pattern: /api/v([0-9]+)/r/(.*)
          variable: var_uri_path
      name: test
      ruleSequence: 1

This should set the Components to URL path but it results in setting it to Both URL path and URL query string. Expected outcome:

Actual outcome:

This breaks our application's rewrite logic.

Ingress Controller details

Output of kubectl describe pod <ingress controller> . The pod name can be obtained by running helm list.

Name:             ingress-appgw-deployment-cc567775f-ktls9
Namespace:        kube-system
Priority:         0
Service Account:  ingress-appgw-sa
Node:             aks-sys98249edv1-10300639-vmss000000/10.10.16.10
Start Time:       Thu, 12 Sep 2024 10:52:30 +0300
Labels:           app=ingress-appgw
              kubernetes.azure.com/managedby=aks
              pod-template-hash=cc567775f
Annotations:      checksum/config: 4840ca8162703375ec3ba0d56802035b3908f91ccafe16b51a81ee01a87c741a
              cluster-autoscaler.kubernetes.io/safe-to-evict: true
              kubernetes.azure.com/metrics-scrape: true
              prometheus.io/path: /metrics
              prometheus.io/port: 8123
              prometheus.io/scrape: true
              resource-id:
                /subscriptions/<redactred>/resourceGroups/<redacted>/providers/Microsoft.ContainerService/managedCluste...
Status:           Running
IP:               10.10.16.109
IPs:
IP:           10.10.16.109
Controlled By:  ReplicaSet/ingress-appgw-deployment-cc567775f
Containers:
ingress-appgw-container:
Container ID:   containerd://6f9b92b8b028947ebf52426fe5f75a52948c08fcaa7783527571316d08dbf57f
Image:          mcr.microsoft.com/azure-application-gateway/kubernetes-ingress:1.7.4
Image ID:       mcr.microsoft.com/azure-application-gateway/kubernetes-ingress@sha256:92cb29fe2583e4e332f4a6610dd3cd812c2c975d388817934c5c33ff50452a75
Port:           <none>
Host Port:      <none>
State:          Running
  Started:      Thu, 12 Sep 2024 10:58:22 +0300
Last State:     Terminated
  Reason:       Error
  Exit Code:    255
  Started:      Thu, 12 Sep 2024 10:56:26 +0300
  Finished:     Thu, 12 Sep 2024 10:56:57 +0300
Ready:          True
Restart Count:  5
Limits:
  cpu:     700m
  memory:  600Mi
Requests:
  cpu:      100m
  memory:   20Mi
Liveness:   http-get http://:8123/health/alive delay=15s timeout=1s period=20s #success=1 #failure=3
Readiness:  http-get http://:8123/health/ready delay=5s timeout=1s period=10s #success=1 #failure=3
Environment Variables from:
  ingress-appgw-cm  ConfigMap  Optional: false
Environment:
  KUBERNETES_SERVICE_HOST:       <redacted>.hcp.westeurope.azmk8s.io
  KUBERNETES_PORT:                tcp://<redacted>.hcp.westeurope.azmk8s.io:443
  KUBERNETES_PORT_443_TCP:        tcp://<redacted>.hcp.westeurope.azmk8s.io:443
  KUBERNETES_PORT_443_TCP_ADDR:   <redacted>.hcp.westeurope.azmk8s.io
  AZURE_CLOUD_PROVIDER_LOCATION:  /etc/kubernetes/azure.json
  AGIC_POD_NAME:                  ingress-appgw-deployment-cc567775f-ktls9 (v1:metadata.name)
  AGIC_POD_NAMESPACE:             kube-system (v1:metadata.namespace)
  AZURE_ENVIRONMENT:              AZUREPUBLICCLOUD
Mounts:
  /etc/kubernetes/azure.json from cloud-provider-config (ro)
  /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-ffhg5 (ro)
Conditions:
Type                        Status
PodReadyToStartContainers   True 
Initialized                 True 
Ready                       True 
ContainersReady             True 
PodScheduled                True 
Volumes:
cloud-provider-config:
Type:          HostPath (bare host directory volume)
Path:          /etc/kubernetes/azure.json
HostPathType:  File
kube-api-access-ffhg5:
Type:                    Projected (a volume that contains injected data from multiple sources)
TokenExpirationSeconds:  3607
ConfigMapName:           kube-root-ca.crt
ConfigMapOptional:       <nil>
DownwardAPI:             true
QoS Class:                   Burstable
Node-Selectors:              <none>
Tolerations:                 CriticalAddonsOnly op=Exists
                         node.kubernetes.io/memory-pressure:NoSchedule op=Exists
                         node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
                         node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:                      <none>

Output of `kubectl logs .

...
-- App Gwy config --            {
-- App Gwy config --                "id": "/subscriptions/<redacred>/resourceGroups/MC_RG-<redacted>_westeurope/providers/Microsoft.Network/applicationGateways/<redacted>/rewriteRuleSets/crd-dev-gw-ingress-dev-<redacted>",
-- App Gwy config --                "name": "crd-dev-gw-ingress-dev-<redacted>",
-- App Gwy config --                "properties": {
-- App Gwy config --                    "rewriteRules": [
-- App Gwy config --                        {
-- App Gwy config --                            "actionSet": {
-- App Gwy config --                                "requestHeaderConfigurations": [],
-- App Gwy config --                                "responseHeaderConfigurations": [],
-- App Gwy config --                                "urlConfiguration": {
-- App Gwy config --                                    "modifiedPath": "/api/v{var_uri_path_1}/{var_uri_path_2}",
-- App Gwy config --                                    "modifiedQueryString": "",
-- App Gwy config --                                    "reroute": false
-- App Gwy config --                                }
-- App Gwy config --                            },
-- App Gwy config --                            "conditions": [
-- App Gwy config --                                {
-- App Gwy config --                                    "ignoreCase": false,
-- App Gwy config --                                    "negate": false,
-- App Gwy config --                                    "pattern": "/api/v([0-9]+)/r/(.*)",
-- App Gwy config --                                    "variable": "var_uri_path"
-- App Gwy config --                                }
-- App Gwy config --                            ],
-- App Gwy config --                            "name": "gateforce-biller",
-- App Gwy config --                            "ruleSequence": 1
-- App Gwy config --                        }
-- App Gwy config --                    ]
-- App Gwy config --                }
-- App Gwy config --            },
...

Any Azure support tickets associated with this issue.

Azure / application-gateway-kubernetes-ingress

Not setting modifiedQueryString still results in a rewrite rule that sets the query string to empty #1648