Confirmed with latest client 4.1.4-201906261555.git.0.c9e4f28.el7, works well:
[root@dhcp-140-138 ~]# oc adm release info registry.svc.ci.openshift.org/ocp/release:4.2.0-0.nightly-2019-06-27-204704   --commits  -o pullspec
quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:e5e539a01405f05cc8a94c04752bec886dfd2e91f421ef94d5b37ea8660747e1
quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:46d6adc979aead6908a57c8a1d771a498f93506c5bc9cd7bb8aceee041fc0242
...

[root@dhcp-140-138 ~]# oc adm release info registry.svc.ci.openshift.org/ocp/release:4.2.0-0.nightly-2019-06-27-204704   --commits  -o digest
sha256:e5e539a01405f05cc8a94c04752bec886dfd2e91f421ef94d5b37ea8660747e1
sha256:46d6adc979aead6908a57c8a1d771a498f93506c5bc9cd7bb8aceee041fc0242
...

[root@dhcp-140-138 ~]# oc adm release info registry.svc.ci.openshift.org/ocp/release:4.2.0-0.nightly-2019-06-27-204704   --commits  -o name
aws-machine-controllers
azure-machine-controllers
...

[root@dhcp-140-138 ~]# oc adm release info registry.svc.ci.openshift.org/ocp/release:4.2.0-0.nightly-2019-06-27-204704   --commits  -o json
{
  "image": "registry.svc.ci.openshift.org/ocp/release:4.2.0-0.nightly-2019-06-27-204704",
  "digest": "sha256:30f79c8afa66dc4cf73dae48d6881e34bc4fcb0fb2fb96e74efee0b1509a7f63",
....

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:1635