The single Approver that matches a given channel has its AddDispatchOperation() called. It does something in response to this (e.g. displays a dialog) and then returns with no error. For some other reason, the Approver now exits without having made a call on the dispatch op (e.g. it crashes on user interaction with the dialog). The operation will never be dispatched. Proposed solution: the Channel Dispatcher should watch for Approvers leaving the bus, and when a dispatch has no matching Approvers left, should be handled as if there were no Approvers.
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