Cannot simplify workflow when all issue types are mapped to the same workflow but individually

When creating a workflow scheme, if you select the workflows to each issue type one by one, even if you choose the same workflow for all issue types, Greenhopper doesn't allow you to Simplify the Workflow, even if all the other restrictions on Using GreenHopper Simplified Workflow - why Not are true.

I've attached two screenshots as an example.

Workaround

Only map the "All Unassigned issue types" in the workflow scheme.