In Invasions where you're dueling a single other Invader, it seems that if the winner's third kill happens at the same time the opposing player also kills you, but neither player has 5 kills/crests total, it warps you to the end chest room but doesn't stop the timer, (the chest "opens" but doesn't do anything), and you're effectively stuck waiting out the clock because the game doesn't think the activity is complete. I waited for the time to expire, and it did [b][i]eventually[/i][/b] spawn rewards rewards from the chest, (actually managed to get the Red Dark Matter Crystal out of this), but it took significantly longer than usual to register the match had finished, on top of waiting the timer out. This happened to me once before where I did leave to orbit instead of waiting, and that rewarded nothing, and wasted all Deathmarks wagered.