Anybody else? I've gone through countless times, and I have 100% found all of the chests.
It says I only need 1 more chest to complete the year one thing.
EDIT: I have found all the chests on that character, but for whatever reason Mars is still saying 4/5. I just found them all on another character and all went smooth and am ready to get the emblem!
Edit2: All golden chests must be found with one character (does not have to be the first character you made). If for any reason you have a character that has found them all but it only says 4/5, then just go and find them all on another character. Hope this helps.
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Bloody hell i am having the same issue but on earth ive ran through three or four times checking every spot again and there is no chest there wtf bungie