After the Izanagi quest was fixed, I have a 'BLACK ARMORY KEY' quest in my inventory that I can not get rid of now. It is taking up a quest slot, and there's no way for me to get rid of it (I have already completed that quest step, and the entire quest). It requires me to have a Mysterious Box (I have 0/1) to do anything with it. I can't discard it or anything.
Hi there, Thanks for your report. We're currently investigating this issue.