Comment 10 for bug 1951182

The bundle issue is easily reproducible.

export-bundle gives

series: focal
applications:
  etcd:
    charm: etcd
    channel: stable
    revision: 691
    resources:
      core: 0
      etcd: 3
      snapshot: 0
    num_units: 1
    to:
    - "1"
    constraints: arch=amd64
    storage:
      data: loop,1024M
machines:
  "1":
    constraints: arch=amd64

When the bundle is redeployed, charmhub is asked to provide metadata and comes back with an "empty" record which juju tries to deploy and fails.