Only one Perl/logger can be used at a time?

[onlyjob]

When I pipe the output to Perl logger, only one logger is working.

sh -c "tail -f /var/log/httpd/access_log | logger -p local6.notice -t apache" &  ## works
sh -c "tail -f /var/log/httpd/error_log  | logger -p local6.error -t apache" &   ## terminates

The above is running from a shell script on CentOS-7 and only the first logger is running.
With one logger running in the background, when I run logger test it hangs without doing anything.

Python logger don't exhibit such problem.

(logger is installed as /usr/local/bin/logger which is a symlink to /usr/local/bin/logger.pl).