Implemented upstream as a simple change to logging: https://github.com/systemd/systemd/pull/4036/commits
It's probably harmless to backport this.
fix merged to upstream staging branch ->
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.