I decided to preview an exotic engram, it showed seven possible items, one being the well known minigun "SWEET BUSINESS." (the very best weapon for my Titan, but most impossible to obtain, for me anyways)
Rolling my cursor over it to show its stats, it says in the red bar "Already added to Collection." I quickly checked my collections at the vault, which shows all my collected exotics, EXCEPT "SWEET BUSINESS." It's not there, I don't know why the game thinks I have it, but i've assumed this means I will never be able to obtain the gun from an exotic engram unless the glitch is fixed. I have picture proof, but not sure where to post it so It can link it to this post.
A reason I think this might be is...
I used the gun extensively in the closed beta (ONLY the closed beta, I never played the beta when it became public after that) So release day, I get my game from gamestop, install the game on my playstation and start it. My 2 original characters from the beta are still there (my Titan and Hunter class) however instead of continuing with them, I deleted the original titan class and created a new one. Doing this, I don't think the game recognized that all originally owned weapons (especially "SWEET BUSINESS") were wiped from my character/profile and that might be why it says I can't get it from the engram.
I won't decrypt another exotic engram until im sure its fixed.
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Also having the exact same problem.