This glitch is going to get you more than one exotic emblem with a guardian that already went flawless. If you went flawless already and claimed your exotic emblem you can get another exotic emblem with the same exact guardian. All you have to do is place your exotic emblem in the vault and then go to the lighthouse and open the flawless chest to claim anothet exotic emblem! This only works once per week and once per guardian when going flawless in trials.