agents >=0.24.0 changed what `queue()` does. Queued callbacks run from the alarm loop in a fresh invocation, so they no longer see the enqueuing request's connection or request through getCurrentAgent(). Silent: code written for older versions still runs, without an error.
Evidence
`Agent.queue()` and friends now delegate to the capability. Queued callbacks run from the alarm loop in a fresh invocation, so they no longer see the enqueuing request's `connection` or `request` through `getCurrentAgent()` (the agent itself is still available).