MongoDB v5.0.14 post upgrade error - Client has attempted to reauthenticate as a single user

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I just upgraded MongoDB replica set from v4.4.16 to MongoDB v5.0.14
After the upgrade, these messages started showing up in mongod.log:

{“t”:{“$date”:“2023-03-06T14:06:23.854-05:00”},“s”:“W”, “c”:“ACCESS”, “id”:5626700, “ctx”:“conn196”,“msg”:“Client has attempted to reauthenticate as a single user”,“attr”:{“user”:{“user”:“__system”,“db”:“local”}}}
{“t”:{“$date”:“2023-03-06T14:06:23.855-05:00”},“s”:“W”, “c”:“ACCESS”, “id”:5626700, “ctx”:“conn195”,“msg”:“Client has attempted to reauthenticate as a single user”,“attr”:{“user”:{“user”:“__system”,“db”:“local”}}}

The messages show up every 5 min
The replica set looks ok, all secondary servers are synced up with the primary.
How do I get rid of these warning messages?

Thanks !
Sally