When you Throne Room a Duration card, the Throne Room remains in play along with it, to "explain" why the duration effect applies twice next turn. My question is, what if the Throne Room is trashed after being played, because of Procession? For example,
play Procession
-> play Throne Room
-> play Laboratory
-> play Laboratory again
-> play Throne Room again
-> play Lighthouse
-> play Lighthouse again
-> trash Throne Room
The Lighthouse would still be in play, and you get $1 twice this turn. But do you get $1 twice next turn, even though the Throne Room is no longer there to "explain" it?
This could get more complex if more Throne Rooms are played:
play Procession
-> play TR1
-> play TR2
-> play Lighthouse
-> play Lighthouse again
-> play TR2 again
-> play Caravan
-> play Caravan again
-> play TR1 again
-> play TR3
-> play Wharf
-> play Wharf again
-> play TR3 again
-> play Fishing Village
-> play Fishing Village again
-> trash TR1
Four duration cards are now played twice each, but only two Throne Rooms remain, unable to explain all of them. Are they all doubled next turn? Are only two of them, and if so, which two? Or are none?
(edit: changed Haven to Caravan, because why would Haven need to be explained next turn?)