vars cannot be resolved in 3.9.0: vars are not found in corresponding resource

[binepedia]

When using kustomize 3.8.8 everythings works just fine. in 3.9.0 however I'll get the error

Error: field specified in var '{SERVICE_A_DNS_NAME networking.k8s.io_v1_Ingress {spec.rules[0].host}}' not found in corresponding resource

Files that can reproduce the issue

kustomization.yaml

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

resources:
  - service-a/service-a.yaml
  - service-b/service-b.yaml

patchesJson6902:
  - path: service-a/patch-service-a-ingress.yaml
    target:
      version: v1
      group: networking.k8s.io
      kind: Ingress
      name: service-a
  - path: service-b/patch-service-b-ingress.yaml
    target:
      version: v1
      group: networking.k8s.io
      kind: Ingress
      name: service-b
vars:
  - name: SERVICE_A_DNS_NAME
    objref:
      apiVersion: networking.k8s.io/v1
      kind: Ingress
      name: service-a
    fieldref:
      fieldpath: spec.rules[0].host
  - name: SERVICE_B_DNS_NAME
    objref:
      apiVersion: networking.k8s.io/v1
      kind: Ingress
      name: service-b
    fieldref:
      fieldpath: spec.rules[0].host

service-a/service-a.yaml

---
apiVersion: apps/v1
kind: Deployment
metadata:
   name: service-a
spec:
   replicas: 1
   selector:
      matchLabels:
         app.kubernetes.io/component: service-a
   template:
      metadata:
         labels:
            app.kubernetes.io/component: service-a
      spec:
         containers:
            -  image: repository/service-a:v1
               imagePullPolicy: Always
               name: service-b
               ports:
                  -  containerPort: 8080
               env:
                  -  name: REDIRECT_URI
                     value: "http://$(SERVICE_B_DNS_NAME):80/oauth_redir"

---
apiVersion: v1
kind: Service
metadata:
   name: service-a
   labels:
      app.kubernetes.io/component: service-a
spec:
   type: LoadBalancer
   ports:
      -  port: 8080
   selector:
      app.kubernetes.io/component: service-a
             
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
   name: service-a
spec:
   rules:
      - host: service-a.k8s.com
        http:
           paths:
              -  path: /
                 pathType: Prefix
                 backend:
                    service:
                       name: service-a
                       port:
                          number: 8080

service-a/patch-service-a-ingress.yaml

- op: replace
  path: /spec/rules/0/host
  value: new-service-a.k8s.com

service-b/service-b.yaml

---
apiVersion: apps/v1
kind: Deployment
metadata:
   name: service-b
spec:
   replicas: 1
   selector:
      matchLabels:
         app.kubernetes.io/component: service-b
   template:
      metadata:
         labels:
            app.kubernetes.io/component: service-b
      spec:
         containers:
            -  image: repository/service-b:v1
               imagePullPolicy: Always
               name: service-b
               ports:
                  -  containerPort: 8080
               env:
                  -  name: REDIRECT_URI
                     value: "http://$(SERVICE_A_DNS_NAME):80/oauth_redir"

---
apiVersion: v1
kind: Service
metadata:
   name: service-b
   labels:
      app.kubernetes.io/component: service-b
spec:
   type: LoadBalancer
   ports:
      -  port: 8080
   selector:
      app.kubernetes.io/component: service-b
             
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
   name: service-b
spec:
   rules:
      - host: service-b.k8s.com
        http:
           paths:
              -  path: /
                 pathType: Prefix
                 backend:
                    service:
                       name: service-b
                       port:
                          number: 8080

service-b/patch-service-b-ingress.yaml

- op: replace
  path: /spec/rules/0/host
  value: new-service-b.k8s.com

Expected output
This output was generated with kustomize 3.8.8 with command kustomize build .
The vars are replaced by the url from the patch files.

apiVersion: v1
kind: Service
metadata:
  labels:
    app.kubernetes.io/component: service-a
  name: service-a
spec:
  ports:
  - port: 8080
  selector:
    app.kubernetes.io/component: service-a
  type: LoadBalancer
---
apiVersion: v1
kind: Service
metadata:
  labels:
    app.kubernetes.io/component: service-b
  name: service-b
spec:
  ports:
  - port: 8080
  selector:
    app.kubernetes.io/component: service-b
  type: LoadBalancer
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: service-a
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/component: service-a
  template:
    metadata:
      labels:
        app.kubernetes.io/component: service-a
    spec:
      containers:
      - env:
        - name: REDIRECT_URI
          value: http://new-service-b.k8s.com:80/oauth_redir
        image: repository/service-a:v1
        imagePullPolicy: Always
        name: service-b
        ports:
        - containerPort: 8080
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: service-b
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/component: service-b
  template:
    metadata:
      labels:
        app.kubernetes.io/component: service-b
    spec:
      containers:
      - env:
        - name: REDIRECT_URI
          value: http://new-service-a.k8s.com:80/oauth_redir
        image: repository/service-b:v1
        imagePullPolicy: Always
        name: service-b
        ports:
        - containerPort: 8080
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: service-a
spec:
  rules:
  - host: new-service-a.k8s.com
    http:
      paths:
      - backend:
          service:
            name: service-a
            port:
              number: 8080
        path: /
        pathType: Prefix
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: service-b
spec:
  rules:
  - host: new-service-b.k8s.com
    http:
      paths:
      - backend:
          service:
            name: service-b
            port:
              number: 8080
        path: /
        pathType: Prefix

Actual output
This output is printed, when using kustomize 3.9.0 with command kustomize build .

Error: field specified in var '{SERVICE_A_DNS_NAME networking.k8s.io_v1_Ingress {spec.rules[0].host}}' not found in corresponding resource

Kustomize version

kustomize version not working:
{Version:kustomize/v3.9.0 GitCommit:826b5d9792fb67c4d8f8cd59747698ebf0b22720 BuildDate:2020-12-10T21:52:58+00:00 GoOs:darwin GoArch:amd64}

kustomize version working:
{Version:kustomize/v3.8.8 GitCommit:72262c5e7135045ed51b01e417a7e72f558a22b0 BuildDate:2020-12-10T18:44:34+00:00 GoOs:darwin GoArch:amd64}

Platform
macOS 10.15.7