This is expected behavior for the type of registry used in the bug's description.
Opened a PR  updating the command's description for cases where image layer size is not relevant or available.
Current PR is https://github.com/openshift/origin/pull/22201
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.