Note: anyone who uses the EC should be carefully testing after switching to p18 (or stay on p17 or lower and use mitigation for the security fixes.)
Checkmk - version 2.2.0p18 - syslog-like message logging seems not to work and 2 open Support tickets seem to indicate the EC is not working as it should and discarding some to all incoming events. (maybe only in some cases, investigation ongoing.)