Bug report: rsyslog 8.2212.0-1~bpo11+1 changes syslog date format, breaks logging to /var/log/messages

Dear all,

according to https://backports.debian.org/FAQ/, bugs found in packages 
from backports should be reported to the debian-backports mailing list.

I would therefore like to report the package upgrade from rsyslog 
package version 8.2208.0-1~bpo11+1 to 8.2212.0-1~bpo11+1 has changed the 
date and time format of syslog entries and there's no further logging to 
/var/log/messages, once rsyslogd is restarted in version 8.2212.0-1~bpo11+1.

A package downgrade of rsyslog to version 8.2208.0-1~bpo11+1 restores 
both the old date format in /var/log/syslog and the logging to 
/var/log/messages. This is reproducible on my two affected machines.

Thank you very much.

With best regards

Christian Hoffmann