You guys clearly stated that if one had an exotic, "we put together an algorithm" (wow, how complicated is it to scan one's inventory prior decoding an exotic engram?!?) so one should not get it again from an exotic engram.
Well, I already got the Zhalo 4 times, the Claws of Ahamkara 4 times, the 4th horseman 3 times (maybe 4 actually, can't remember), and I got roughly 50% of my other year 2 exotics twice.
The worst irony, after a gazillion strikes yesterday night (i.e. the nerf to 3 of coins is not working as you said either / drop rates are now much lower with strikes), I got the heart of the praxic fire even though I was wearing it during all those strike - maxed out for a long time now mind you - and while Xur is selling it.
Do what you say or please stop lying to us. This is sickening when I trusted you guys and spent so much time (and three of coins) on strikes for such results...
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The only exotics designed to lean heavily towards ones you don't have are the legacy engrams from Xur. That said it appears the algorithm only works at time of purchase and not when you go to decode, resulting in multiples of the one you were missing, which should be fixed. Any engram dropped in game (year 2 exotics) will not have the algorithm applied to it.