[docker-compose] syslog() not work

$ sudo ls -la /proc/$(pidof rsyslogd)/fd
totale 0
dr-x------ 2 root   root    0 dic 23 08:54 .
dr-xr-xr-x 9 syslog syslog  0 dic 23 08:54 ..
lr-x------ 1 root   root   64 dic 23 20:54 0 -> /dev/null
l-wx------ 1 root   root   64 dic 23 20:54 1 -> /dev/null
l-wx------ 1 root   root   64 dic 23 20:54 2 -> /dev/null
lrwx------ 1 root   root   64 dic 23 08:54 3 -> 'socket:[19540]'
lr-x------ 1 root   root   64 dic 23 20:54 4 -> /dev/urandom
lr-x------ 1 root   root   64 dic 23 20:54 5 -> /proc/kmsg
lrwx------ 1 root   root   64 dic 23 20:54 6 -> 'socket:[29286]'
l-wx------ 1 root   root   64 dic 23 20:54 7 -> /var/log/syslog
l-wx------ 1 root   root   64 dic 23 20:54 8 -> /var/log/kern.log
l-wx------ 1 root   root   64 dic 23 20:54 9 -> /var/log/auth.log

$ netstat -x | grep 19540
unix  2      [ ]         DGRAM                    19540 
/run/systemd/journal/syslog

$ cat docker-compose.override.yml
services:
     web:
         image: php:apache
         extra_hosts:
             -  "host1:192.168.1.15"
         logging:
             driver: syslog
             options:
                 syslog-address: "udp://host1:19540"
                 tag: "{{.Name}}/{{.ID}}"

$ docker-compose run web php -r 'syslog(LOG_ERR, "ABC") && 
print("OK!!!\n");'
WARNING: Found orphan containers (window-resources_window-resources_1) 
for this project. If you removed or renamed this service in your compose 
file, you can run this command with the --remove-orphans flag to clean 
it up.
Creating window-resources_web_run ... done
OK!!!

$ journalctl -n | grep ABC || echo NOT FOUND
NOT FOUND

Why?