Moving a ticket won't remove approval need

Summary

When moving a ticket from a workflow that requires approval to another that does not, the approval need will not be removed, even though the target workflow does not use it.

Steps to Reproduce

1. Modify the workflow from an issue type on a Service Desk Project to require approval, and have at least one issue type on the same project that does not have approval as part of the workflow.
2. Create a ticket on the issue type that needs approval
3. Move the ticket to the issue type that does not require approval

Expected Results

The approval need is removed.

Actual Results

The ticket will still need to be approved.

Workaround

Update (23/10/2017): The provided workaround in this bug report is only applicable to Server instances only and has been removed. There is no known workaround.