Sooooo we got a problem.. one Silent Fang at The Grottos on Cosmodrome instead of three.
I found a discussion on reddit with a temporary solution: Kill the one silent fang, go to orbit, then relaunch patrol on cosmodrome and go kill the one again and repeat until finished.
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What I've read so far is it wasn't done on purpose and bungie was looking into it. Possible quick fix was to kill him once to complete the bounty. The blades of crota use to spawn. Now it's rinse and repeat and the same with this lousy bounty.