Rewatching Empire Strikes Back, and it seems Vader is sending his fleet to hunt down the Millennium Falcon in unnecessary danger (asteroids), and when it is known that the Emperor is waiting, he immediately moves his fleet out of the field. It seems from the get-go Vader knew about Luke's survival and was trying to keep it under the radar.

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    IIRC, Vader moved Executor out of the asteroid field for better comm transmission/reception for his little chat with Palpatine. Luke's survival of what? The Battle of Hoth? Or Luke having actually been born? And do you want a Legends answer, Canon, or both? – SpaceWolf1701 Jun 22 '20 at 1:58