Recently i'm seeing a few messages deferred with status=deferred
(bounce or trace service failure)

instead of status=deferred (host .. said: 450 ...)

from the logs:

postfix/smtp[272605]: warning: unexpected protocol
delivery_request_protocol from private/bounce socket (expected:
delivery_status_protocol)
postfix/smtp[272605]: warning: read private/bounce socket: Application error
postfix/smtp[272605]: status=deferred (bounce or trace service failure)

This started right after upgrading the mx server (from ubuntu 20 focal
to ubuntu 22 jammy, postconf mail_version now reports 3.6.4 (not sure
before).

But i have another mx server with similar config, on jammy and 3.6.4
for a long time.

I don't have anything special in the configuration re deferred or bounce.

Why would the status be "bounce or trace service failure" as opposed
to the usual "host said: 450..." reply from the remote server?
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