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The event is triggered for the related Test Execution issue. This means that, in the notification configuration screen, most of the fields (e.g. "Reporter", "Project Lead", "Component Lead", "Project Role", "All Watchers", "User/Group custom field value") refer to the associated Test Execution issue or to the Test Execution issue's project. The exception is the "Current assignee", which is handled has being the user assigned to the Test Run and not the user assigned to the Test Execution issue.
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