Steps to Reproduce
1. Create a Job
2. In Source Code Management, Select "Perforce" Source Code Management Tool
3. In the Project Details: Workspace (client) field enter myworkspace-${JOB_NAME}
4. Check the "Let Jenkins Create Workspace" box
5. Build Job - the workspace will be created.
6. Return to the Job page
7. Look under Project Details: Workspace (client) - despite the Workspace being created (it was created in step 5) the warning "Workspace does not exist. If "Let Hudson/Jenkins Manage Workspace View" is check the workspace will be automatically created." is still shown despite the workspace existing.