Workflow `output_task` does not take the final sorted task

[vachillo]

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Describe the bug
when calling output_task on a workflow, the last task that was passed in the list of tasks is returned, rather than the sorted last task.

To Reproduce
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2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Version [e.g. 0.5.1]

Additional context
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