Issue Summary

In Old Navigation UI, if we add "/c/" to the URL of a TMP Board, it shows the Project & Board as CMP instead of showing "Not Found or HTTP 404" error.

If we go to Personal settings, disable the new Navigation UI, then add yourself to a TMP project as an administrator under Project settings>>Access, then browse to the following Board URL directly: https://abc.atlassian.net/jira/software/c/projects/ABCD/boards/1234

Then it shows the Project as a Company Managed Project, and the Board also loads successfully without any "Not Found or HTTP 404" error. The board should not load as the Project is a TMP one, and thus the board is a simplified board, so it should show "Not Found" or "HTTP 404" error.

Steps to Reproduce

1. In your site, go to Global Settings>>Personal Jira settings>>Disable "New Navigation"
   
2. Go to Project settings>>Access, of a Team Managed Project & add yourself as an Administrator or Member. 
3. Ensure that you are able to browse the Simplified Board of the Team Managed Project.
4. Now browse directly to the following Company Managed Board (Non-simplified board) URL by adding "/c/" to the URL of the TMP Board(Simplified) : https://abc.atlassian.net/jira/software/c/projects/ABCD/boards/1234

Expected Results

• It should get redirected to the "Not found" page and show an HTTP 404 Not Found error like below: 
• 

Actual Results

We are able to, incorrectly, load the Board. Also, the TMP Project shows as "Company Managed Project".  This misguides users, and they use the Simplified board as a non-simplified board and create confusion among users. 

Workaround

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