I tried posting this once but it never showed up so here goes a second try, apologies if this double posts. I finished a flawless run and got an eye of sol alongside the usual adept messenger. This eye of sol had a shader called "Vizier Regalia" on it, so I dismantled the eye of sol to acquire that shader so I could use it on other armor, but it didn't drop from it. Am I missing something here?
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Check to see if you have the shader unlocked already. If you do, that might be why it's not dropping for you.