No active session found for correlation token in Amazon Echo Skill

Hey folks, the built-in Amazon Echo Skill fills the log with the following errors:

Error making Call to Alexa message gateway: {"header":{"namespace":"System","name":"Exception","messageId":"xxx"},"payload":{"code":"INVALID_REQUEST_EXCEPTION","description":"com.amazon.iota.container.exception.NoCorrelationSessionFound: No active session found for correlation token : XXX"}}

It looks like it doesn't affect the operations, but it is still annoying, at least, and it's a symptom of a more significant problem, at most.

I tried to re-authenticate the Alexa skill with Hubitat, it didn't help.

I saw a couple of posts about similar problems, for example [1] and [2], but no practical steps for investigation or resolution were suggested, not even by @bobbyD (unless I missed something obvious).

I just wanted to take another stab at it.