contour: Envoy segfaults and errors when ExternalName service is defined

What steps did you take and what happened: When executing the below code to define an externalName service all Envoy pods segfault and error.

apiVersion: projectcontour.io/v1
kind: HTTPProxy
metadata:
  name: externaltest
  namespace: default
spec:
  routes:
    - services:
      - name: externaltest
        port: 443
      requestHeadersPolicy:
        set:
        - name: Host
          value: projectcontour.io
---
apiVersion: v1
kind: Service
metadata:
  labels:
    run: externaltest
  name: externaltest
  namespace: default
  annotations:
    projectcontour.io/upstream-protocol.tls: 443,https
spec:
  externalName: projectcontour.io
  ports:
  - name: https
    port: 443
    protocol: TCP
    targetPort: 443
  type: ExternalName
---
apiVersion: cert-manager.io/v1
kind: Certificate
metadata:
  name: externaltest
  namespace: projectcontour
spec:
  secretName: externaltest
  commonName: "externaltest.mydomain.com"
  dnsNames:
  - "externaltest.mydomain.com"
  issuerRef:
    name: letsencrypt-prod
    kind: ClusterIssuer
---
apiVersion: projectcontour.io/v1
kind: HTTPProxy
metadata:
  name: externaltest
  namespace: projectcontour
spec:
  virtualhost:
    fqdn: externaltest.mydomain.com
    tls:
      secretName: externaltest
  includes:
    - name: externaltest
      namespace: default

Logs from an Envoy pod:

[2021-01-10 01:55:23.463][1][critical][main] [source/exe/terminate_handler.cc:13] std::terminate called! (possible uncaught exception, see trace)
[2021-01-10 01:55:23.463][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:91] Backtrace (use tools/stack_decode.py to get line numbers):
[2021-01-10 01:55:23.463][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:92] Envoy version: 8fb3cb86082b17144a80402f5367ae65f06083bd/1.16.0/Clean/RELEASE/BoringSSL
[2021-01-10 01:55:23.463][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #0: [0x55608e88fe0b]
[2021-01-10 01:55:23.463][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #1: [0x55608e88fc79]
[2021-01-10 01:55:23.463][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #2: [0x55608ee9ef93]
[2021-01-10 01:55:23.463][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #3: [0x55608e748542]
[2021-01-10 01:55:23.463][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #4: [0x55608e2dbcfd]
[2021-01-10 01:55:23.463][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #5: [0x55608e0c31d5]
[2021-01-10 01:55:23.464][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #6: [0x55608e0c6773]
[2021-01-10 01:55:23.464][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #7: [0x55608e0c5b15]
[2021-01-10 01:55:23.464][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #8: [0x55608e0c634b]
[2021-01-10 01:55:23.464][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #9: [0x55608e0c4d50]
[2021-01-10 01:55:23.464][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #10: [0x55608e2de8a5]
[2021-01-10 01:55:23.464][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #11: [0x55608e2d8366]
[2021-01-10 01:55:23.464][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #12: [0x55608e710fe8]
[2021-01-10 01:55:23.464][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #13: [0x55608e70f9be]
[2021-01-10 01:55:23.464][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #14: [0x55608e2bb79c]
[2021-01-10 01:55:23.464][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #15: [0x55608d619008]
[2021-01-10 01:55:23.464][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #16: [0x55608d619807]
[2021-01-10 01:55:23.464][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:98] #17: [0x55608d617bdc]
[2021-01-10 01:55:23.464][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:96] #18: __libc_start_main [0x7f1979649b97]
[2021-01-10 01:55:23.464][1][critical][backtrace] [bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:104] Caught Aborted, suspect faulting address 0x1

Pods:

kubectl get pods -n projectcontour                                    389ms  Sun 10 Jan 13:15:25 2021
NAME                            READY   STATUS      RESTARTS   AGE
contour-8556b76b45-h2g5k        1/1     Running     0          8m56s
contour-8556b76b45-xm5ht        1/1     Running     0          8m56s
contour-certgen-v1.11.0-f5zs9   0/1     Completed   0          8m56s
envoy-7vbvh                     1/2     Error       1          8m56s
envoy-9bdzh                     1/2     Error       1          8m56s
envoy-xmnf8                     1/2     Error       1          8m56s

What did you expect to happen: Service is created successfully

Environment:

• Contour version: -1.11.0
• Kubernetes version: (use kubectl version): Server Version: version.Info{Major:“1”, Minor:“17”, GitVersion:“v1.17.14”, GitCommit:“f238f5142728be4033c37aa0ad69bf806090beae”, GitTreeState:“clean”, BuildDate:“2020-11-11T13:03:54Z”, GoVersion:“go1.13.15”, Compiler:“gc”, Platform:“linux/amd64”}
• Kubernetes installer & version: Rancher K8S latest stable
• Cloud provider or hardware configuration: self hosted, 3 node vmware cluster
• OS (e.g. from /etc/os-release): Ubuntu 20.04