Verified in Satellite 6.4.2 Snap 1
I followed the reproducer steps outlined in the initial report.
After making the config changes, and restarting the foreman-tasks service, I kicked off a number of repository sync jobs as well as content view publishes.
At no point did the reported error manifest.
-bash-4.2# grep "ERROR -- /clock:" /var/log/foreman/dynflow_executor.output
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.