Hi there. Shaders have to have been in your inventory or vault at the time Collections was implemented in order for them to be tracked and added. Being applied to an item doesn't count — just like how you must first dismantle a new item to get its shader before it gets added. Unfortunately, as you found out, year one shaders don't drop when you dismantle the item. However, as this is an Eververse shader, it has the potential to drop from Bright Engrams or be sold directly in the Eververse Store for Bright Dust.