when you get tab back with PriorTabs - it resurrects by its own, without its browsing history.
on the contrary, 'Undo Last Closed' built-in option reloads old tab with all the 'back' steps saved.
I never intended any history for PriorTabs. I have no idea on how to include a history. The advantage for PriorTabs is that a user can choose a tab other than the last one closed.