Steps to reproduce:
1) Go to a bug 2) Mark it as a duplicate 3) Follow the new link to the target dup bug 4) Hit Back 5) The "Mark this bug as a Duplicate" link is back 6) Hit Reload, the "This bug is a duplicate of XXXX" is now shown correctly.
Steps to reproduce:
1) Go to a bug
2) Mark it as a duplicate
3) Follow the new link to the target dup bug
4) Hit Back
5) The "Mark this bug as a Duplicate" link is back
6) Hit Reload, the "This bug is a duplicate of XXXX" is now shown correctly.