Must get complete. It will show 3 gold triangle on top right. I have notice that even if you don't beat boss/do the task, it will still say complete, you just won't the 3 gold triangle.
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I get the 3 gold triangles every single time. My grimoire progress for gold-tier ratings is continually going up, but I haven't seen a reward for like 2 days or so.
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Might be a bug, maybe next patch will fix? I would still try and keep doing them in case it decides to work :/. Gl man