I used to play in the Trials of the Nine game type when it was available last year. During such time, I gained two shaders: Gift of the Nine, and Honor of the Nine. I have Honor of the Nine available to reclaim in my shaders Collections, but for some reason, Gift of the Nine is not available. I had it on two items- a ghost shell, and sparrow. I deleted the Ghost shell, hoping the shader would drop, and it did not. I still have my season 1 exotic Vanashing Point sparrow equipped with Gift of the Nine... Why cant I obtain a shader from the collections that I rightfully earned???
You needed to have the shader in your inventory or vault at some point after Warmind. It doesn't count if it's applied to an item, and year 1 shaders don't get returned upon dismantling the item.