Replacing the workflow for a request type to a workflow from a different project adds fields from the request form and issue view to the default issue type screen scheme

Issue Summary

Using the replace workflow feature from the request types configuration page:

After replacing the workflow to a workflow from a different project, the fields from the request form and issue view will be added to the default screen scheme.

Steps to Reproduce

1. Add a field to the request form for a request type that uses an issue type using a specific issue type screen scheme (not the default screen scheme)
2. Replace the workflow for this request type to a workflow from a different project

Expected Results

No changes to the issue type screen schemes for the current project.

Actual Results

The fields from the request form & issue view are added to the default issue type screen scheme for the current project.

Workaround

Currently there is no known workaround for this behaviour. A workaround will be added here when available

To fix this, associate the new issue type with the old issue type screen scheme from global settings. 
Then remove the added fields from the default issue type screen scheme.