kustomize: Problem reusing a base containing a variable

When I include a base that defines and uses a variable twice, the variable is not expanded.

Example:

component1/kustomization.yaml:

resources:
  - resources.yaml

vars:
  - name: VAR
    objref:
      apiVersion: v1
      kind: Pod
      name: component1

component1/resources.yaml:

apiVersion: v1
kind: Pod
metadata:
  name: component1
spec:
  containers:
    - name: component1
      image: bash
      env:
        - name: VAR
          value: $(VAR)

app1/kustomization.yaml:

bases:
  - ../component1

namePrefix: app1-

app2/kustomization.yaml:

bases:
  - ../component1

namePrefix: app2-

kustomization.yaml:

bases:
  - app1
  - app2

Output:

apiVersion: v1
kind: Pod
metadata:
  name: app1-component1
spec:
  containers:
  - env:
    - name: VAR
      value: $(VAR)
    image: bash
    name: component1
---
apiVersion: v1
kind: Pod
metadata:
  name: app2-component1
spec:
  containers:
  - env:
    - name: VAR
      value: $(VAR)
    image: bash
    name: component1

Output when you comment out one of the app bases in the toplevel kustomization:

apiVersion: v1
kind: Pod
metadata:
  name: app1-component1
spec:
  containers:
  - env:
    - name: VAR
      value: app1-component1
    image: bash
    name: component1

Note: this example is silly, but it shows the problem succinctly. In my case, I have an application that uses a variable to discover a database service name to connect to. That application is then used as a base multiple times in order to deploy multiple versions of it.