Workflow/Activity fiber terminates with unhandled error. #5876
Description
What version of Effect is running?
latest
What steps can reproduce the bug?
Running the @effect/workflow example with debug logging enabled and the WorkflowEngine.layerMemory instead of the ClusterWorkflowEngine.layer will log unhandled fiber terminations when the activity yields a SendEmailError.
What is the expected behavior?
No errors should be logged.
What do you see instead?
timestamp=2025-12-06T00:35:47.920Z level=DEBUG fiber=#32 message="Fiber terminated with an unhandled error" cause="Error: {\"message\":\"Failed to send email for 123 on attempt 1\",\"_tag\":\"SendEmailError\"} at SendEmail at EmailWorkflow.execute"
Additional information
Maybe we can safely turn the error message off in this instance?
Workflow.ts (intoResult)
return effect.pipe(
Effect.withUnhandledErrorLogLevel(Option.none()), // ADDED
// So we can use external interruption to suspend a workflow
Effect.fork