As the title mentions, the Trials Memento shaders seems to be bugged.
In my scenario, I applied the Trials Memento to Rufus's Fury last season but didn't quite get it to level 30 to apply the shader. Today, I realized my Rufus's Fury was now level 31. I went to apply the shader and it wasn't available. Usually it's right there on the first page but I checked every page nonetheless. No dice.
I then checked Destiny Item Manager as I remembered you can search / apply shaders using the app. When I searched for the shader name (Gleaming Keepsake) under the Rufus's Fury, it returned no results.
But the shader hasn't been deleted or anything as it is currently equipped to my Enigma Glaive. Screenshots for all this are attached via the Imgur link.
-My Rufus's Fury (Adept) was acquired and applied with the Trials memento last season but leveled to 30 this season (Season of the Deep)
-This Rufus's Fury is Adept and has been Enhanced to Tier 3
-I have 3 characters. This bug is not specific to one class.
-All DLC owned. Not a new light player.
-Game version: Windows via Xbox Game Pass