I first started one mission of stealth with the apparel they give us with the bonus stealth. NPCs were spotting me through grilled vent in the ceiling and they were VERY motivated to search for me for an eternity (I craved for a: “it must be the wind” line). I did it with 1 point in, it wasn’t easy but less of a pain and NPCs could abandon the search with a nice “He got away”. I still saved a bunch and repeat some sections for this one. I think the last mission or second to last I just given up and change status from detected to danger and undected again in repeat.