I see this in the dominion wiki.
"Other extra turns, such as from Outpost (in Seaside) can happen in-between those turns; however after the last extra turn due to Fleet, no other extra turns can happen (since e.g. Outpost does not keep the game going after it ends)."
As you said previously, it sounds like this is expected behaviour, although I'm not sure I understand why one player gets the benefit of playing an Outpost and getting an extra turn, when the 'final turn' player does not. :/
"Other extra turns, such as from Outpost (in Seaside) can happen in-between those turns; however after the last extra turn due to Fleet, no other extra turns can happen (since e.g. Outpost does not keep the game going after it ends)."
As you said previously, it sounds like this is expected behaviour, although I'm not sure I understand why one player gets the benefit of playing an Outpost and getting an extra turn, when the 'final turn' player does not. :/