Yesterday I get directly from the Titan a hidden blade, but in the loot of my inventory, are only the Two Hidden Blades, I had before the Titanbattle.
A have no Screenshot, because its the First Bug for me.
Report this directly to Game Support:
https://smallgiant.zendesk.com/hc/en-us/requests/new
Be patient; they are handling a higher volume of requests during the holiday season, and will get to every request in the order it is received. 
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thank you for this answer.