So you discarded a tab and later when you click on the discarded tab , it reloads the page.

First:

OnUpdated() gets called with changeInfo.discarded === true

and on reload:

1. onUpdated() gets called with changeInfo.discarded === false.
2. onUpdated() gets called with changeInfo.status === complete.

How, would I know that the tab in Step 2 is the replacement for the discarded tab. The tab.id has changed by now and the tab.discarded property of the newtab has also been reset. So, ducktyping?