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Date & Time: Since 20th of March
Frequency: Always
World name: Ultros
Character name: Reginald Thorne
Party or solo: Solo
Area and coordinates: Everywhere
Steps:
After placing Top 12 in Armorer rankings for the Ishgardian Restoration season on Ultros I received a GM mail containing the Writ of Commendation and Writ of Beatification items which I used to receive the seasonal achievements.

The next day I received another GM mail containing an additional Writ of Commendation, presumably because I also placed in the top 100 of the Botanist rankings.

I took the additional Writ of Commendation but because I already have the achievement it grants, I cannot use the item, and it also cannot be discarded or otherwise removed from my character's items. So it is wasting an inventory slot with a useless item that I can't use or get rid of.

Screenshots: