I just did a full run of the coil and upon getting to the end with a platinum score I couldnt open a single 1 of the chests. It just kept saying that I needed to hold square to collect my loot and after I was sent to orbit via the activity timing out I didn't get any of the loot I worked hard to get. 40 mins if my life wasted and I literally have nothing to show for it so I want my loot.
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Did you have a key to open the chest? If not... than no rewards.