running workflows showing with the "?" symbol

[oliver-sanders]

When starting a stopped workflow, it will sometimes show in the GUI with the "?" symbol rather than the "▶" icon for a running workflow.

From inspecting the UI data store, when the workflow is started, the status and statusMsg fields are initially provided correctly:

 status: "running", statusMsg: "running"

But are then quickly set to "" in a subsequent delta:

status: "", statusMsg: ""

Then, this happens again leaving the workflow with status "" causing the workflow-icon component to display the ? and preventing mutations from being run against the workflow.