Um...how about being able to disappear from the region in the middle of the turn??
It was an honest question, I am trying to figure out the changes.
Even as a priest, when I try to embark on a boat the game tells me:
"Sea of Silence
You are currently embarking ships in Port Raviel.
You will reach the open sea in about 5 hours."
But it does not, in fact, update every hour: it is only resolved on the turn.
I never checked the scout report when that happen, does the noble disappear entirely as soon as he starts to embark? If yes, then it seems more of a bug than an unintended consequence: the games tells different characters different things. You should only disappear from scout reports once your boat has actually left shore, and in the meantime your status should be "travelling".
In the case of Liara, I think I always could check only 1 turn afterwards, in which case there was indeed enough time for the infiltrator to leave.