Hello,
At this point you are playing the game we all do, which is RNG.
Legend/Master lost sectors do not have any guarantee that you receive items you have not yet acquired.
It is a random chance to get one of the many Helmets/Daily focused items.
At this point you need to constantly run Lost sectors to unlock the items.
Hope this helps clarifying the situation, sadly it is not a bug, just RNG.
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You are wrong... the exotics that I had never gotten before in my collection (aka were grey) dropped every single time first across all 3 of my characters. I just got back into destiny and there is no way that I'm that lucky. You probably already had them drop and that's why yours acted differently.
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That literally might be your luck. I get my exotics the same season they drop, probably in the first week or so. So I run them, and thats at least how my experience is.