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RAW (with updates included), you know exactly where the creature is unless they made a successful stealth check.
No, I was describing a non combat situation. You certainly wouldn't know where the creature was exactly once it left your line of sight around a corner or into a room of total darkness (and had new turns totally out of LoS). If could have went entirely into another part of the dungeon, exited the room, etc.
It's no different than trailing someone, 50 feet back, through a crowded street who then ducks into a tavern. You obviously no longer know the exact square that creature is in if you are still on the street, unless you have x-ray vision like superman.
All you know is your characters had a foe in sight at one point, but lost him. Just because you saw a creature at one point, certainly does not mean that you know where it is forever in the game world until it makes a stealth check.
Now if a combat had already started, then sure you go through the normal stealth check routine if they try to hide somewhere in the battle scene. I noted that you would only have to pick a square if you had failed all your appropriate checks (including passive perception), if the creature was actually still in the dark room when you got to it.
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