I made a post about this, but wanted to re-address it now that I have video-evidence of it happening. Basically I decrypt Engrams and find that I get nothing from some of the engrams. This one was a Legendary, but this has happened with Exotics, twice.
I wouldn't complain so much because I have nearly every bit of exotic gear/equipment, but when it happens with exotics it becomes a waste of 3 of Coins, which becomes a waste of Strange Coins.
Hopefully Cozmo and the others can take a look into this issue.
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As Eriena stated, it clearly turned into a legendary artifact. This does NOT happen with exotics in all my time playing I have never had it with all the exotics I have turned in.