TNS-01189: The listener could not authenticate the user

In 19c GI environment, TNS-01189 is still being received hourly from OEM 13cR3 for both local listeners and SCAN listeners, though Oracle said this issue has been fixed since 12.1.0.2.

The OEM alert:

Host=racnode2.virtuallab
Target type=Listener
Target name=LISTENER_SCAN1_racnode-cluster
Message=TNS-1189. Please check log for details.
Severity=Critical
Event reported time=May 1, 2020 9:26:35 PM 
Operating System=Linux
Platform=x86_64
Associated Incident Id=1513
Associated Incident Status=New
Associated Incident Owner=
Associated Incident Acknowledged By Owner=No
Associated Incident Priority=None
Associated Incident Escalation Level=0
Event Type=Metric Alert
Event name=TNS_ERRORS:tnserrmsg
Total Occurrences=115
Occurrences in this event=45
First Occurred in this event=Apr 28, 2020 10:11:23 AM 
Last Occurred in this event=May 1, 2020 8:10:06 PM 
Metric Group=TNS Errors
Metric=TNSMsg
Metric value=TNS-1189(version)
Key Value=TNS-1189
Key Column 1=TNSError
Rule Name=Incident management rule set for all targets,Create 
          incident for critical metric alerts
Rule Owner=System Generated
Update Details:
TNS-1189. Please check log for details.

The local listener and scan listeners error log:

1-MAY-2020 19:10:35 * (CONNECT_DATA=(COMMAND=version)) * version * 1189
TNS-01189: The listener could not authenticate the user