Request type field shows previous request type value in issue navigator list view

Summary

When an issue type is changed on a ticket, it will break the request type mapping and the request type field will be displayed as No match. However, if the ticket is viewed in the issue navigator list view, the request type field shows the previous request type value so searching for request type null/empty would not return a value.

Steps to Reproduce

1. Create a ticket via the customer portal. Make sure the request type is valid.
2. Change the issue type of the ticket.

Expected Results

The request type shows no match and the field is empty in the issue navigator list view.

Actual Results

The request type shows no match and the field shows the previous value in the issue navigator list view.

Notes

This affect both tickets when changing the issue type directly or moving issues to own/other projects.