sdk-core
                                
                                
                                
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                        [Bug] Core doesn't expose the `cause` from `WorkflowExecutionCancelRequestedEventAttributes`
Event has a reason:
https://github.com/temporalio/api/blob/6606687fb5ca8d899fe3e93313d53d9c7ed2a379/temporal/api/history/v1/message.proto#L403
Activation Job has details:
https://github.com/temporalio/sdk-core/blob/4840a9c570fa3388e190e20f01f61065d0b7e965/sdk-core-protos/protos/local/temporal/sdk/core/workflow_activation/workflow_activation.proto#L242
Must have been a mix up with WorkflowExecutionCanceledEventAttributes:
https://github.com/temporalio/api/blob/6606687fb5ca8d899fe3e93313d53d9c7ed2a379/temporal/api/history/v1/message.proto#L414