Missing Mastercrafted Feline armor diagrams

[Piterros990]

I've run into an issue where despite finishing the quest, the armor blueprints disappeared from blacksmith. I went to the cave where the chest with armor was, and it's empty. Is there anything I can do to fix this?

[Gaunter O'Dimm]

Are you using a master / grandmaster level armorer? Or maybe your crafting filters have changed?

[C]

To check if you have it, got to the inventory menu > crafting and look up for the blueprints, if they are there all you need to find is an armorer level Master or Grandmaster.
There is one in Velen at the Baron's place but you need to unlock the quest then find the tools on Skellige.
For Blade master there is an Elven Blacksmith Hatori in Novigrad (like Hatori hanzo in Kill Bill , yeah.. lots of Tarantino references in the game) Finish the quest line and he will craft Master Weapons for you.
The Grand Master Armorsmith is on the DLC Blood and Wine in Touissant.

[Piterros990]

Okay, the quest was what I was missing. Thanks a lot!