podman: `podman inspect` filters not working in `podman-2.2.1` to `podman-3.2.0_rc1`

Is this a BUG REPORT or FEATURE REQUEST? (leave only one on its own line)

/kind bug

Description

Running podman inspect -f '{{ <filter> }}' <image> with certain filter strings no longer works with podman-2.2.1.

Describe the results you received:

The command:

podman inspect --format "imageId: {{.Id}} size: {{.Size}}" <image>

… (which comes from the podman help output) works as expected. However:

podman inspect --format '{{ .Config.Env }}' <image>

… returns no output.

podman inspect <image> | jq '.[].Config.Env'

… however, still does (demonstrating that the data is there)

Describe the results you expected:

As previous releases, podman inspect -f '{{ .Config.Env }}' <image> would display the environment variables embedded within the specified image.

Output of podman version:

Version:      2.2.1
API Version:  2.1.0
Go Version:   go1.15.5
Git Commit:   a0d478edea7f775b7ce32f8eb1a01e75374486cb
Built:        Wed Dec  9 11:33:11 2020
OS/Arch:      linux/amd64

Output of podman info --debug:

host:
  arch: amd64
  buildahVersion: 1.18.0
  cgroupManager: cgroupfs
  cgroupVersion: v2
  conmon:
    package: Unknown
    path: /usr/bin/conmon
    version: 'conmon version 2.0.21, commit: 35a2fa83022e56e18af7e6a865ba5d7165fa2a4a'
  cpus: 8
  distribution:
    distribution: gentoo
    version: unknown
  eventLogger: file
  hostname: dellr330
  idMappings:
    gidmap: null
    uidmap: null
  kernel: 5.9.6-gentoo
  linkmode: dynamic
  memFree: 871362560
  memTotal: 33392836608
  ociRuntime:
    name: crun
    package: Unknown
    path: /usr/bin/crun
    version: |-
      crun version 0.16
      commit: eb0145e5ad4d8207e84a327248af76663d4e50dd
      spec: 1.0.0
      +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +YAJL
  os: linux
  remoteSocket:
    path: /run/podman/podman.sock
  rootless: false
  slirp4netns:
    executable: ""
    package: ""
    version: ""
  swapFree: 21837553664
  swapTotal: 25769787392
  uptime: 615h 32m 37.93s (Approximately 25.62 days)
registries:
  localhost:5000:
    Blocked: false
    Insecure: true
    Location: localhost:5000
    MirrorByDigestOnly: false
    Mirrors: []
    Prefix: localhost:5000
  search:
  - docker.io
  - docker.pkg.github.com
  - quay.io
  - public.ecr.aws
store:
  configFile: /etc/containers/storage.conf
  containerStore:
    number: 26
    paused: 0
    running: 23
    stopped: 3
  graphDriverName: overlay
  graphOptions:
    overlay.ignore_chown_errors: "false"
  graphRoot: /space/podman/storage
  graphStatus:
    Backing Filesystem: extfs
    Native Overlay Diff: "true"
    Supports d_type: "true"
    Using metacopy: "false"
  imageStore:
    number: 466
  runRoot: /space/podman/run
  volumePath: /space/podman/volumes
version:
  APIVersion: 2.1.0
  Built: 1607513591
  BuiltTime: Wed Dec  9 11:33:11 2020
  GitCommit: a0d478edea7f775b7ce32f8eb1a01e75374486cb
  GoVersion: go1.15.5
  OsArch: linux/amd64
  Version: 2.2.1

Have you tested with the latest version of Podman and have you checked the Podman Troubleshooting Guide?

Yes