[{quoted}](name=Tsundere Supp,realm=NA,application-id=LqLKtMpN,discussion-id=Er9xa4Ee,comment-id=0000,timestamp=2016-03-26T05:35:09.152+0000)
This isn't a bug you're just looking at it wrong. When you go in promos as long as you win 2 games you go to the next division with 0lp. If you lose promos and go 1w-2l you normally have around 80lp (depending on what your lp gains and losses look like) if you lose your promos and go 0w-2l then you normally have around 60lp. You do lose LP for every promo game you lose BUT if you win your promos you get taken to 0lp next division no matter what. If you lose your promos the game still tracks how much LP you would have had if you weren't in promos to begin with. So you would have lost LP for both promo games either way...because you lost 2 games AND didn't get promoted.
You also forgot to mention if you go 2-0 you improve your MMR, and the following games you will most likely get (slightly) more LP.