If we are closing, then it should be as DUPLICATE. It is a valid bug, but getting a test case is more likely in Bug 1869588 and Bug 1869588 is reporting the same behavior. The reloading of redirect chain is tracked in Bug 968273.
Bug 795640 Comment 7 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
If we are closing (which I'm not sure we should), then it should be as DUPLICATE. It is a valid bug, but getting a test case is more likely in Bug 1869588 and Bug 1869588 is reporting the same behavior. The reloading of redirect chain is tracked in Bug 968273.