Finished Legendary Weekly Project - No Exotic Cache
I just finished the weekly legendary project at Capitol building and it did not give me the exotic cache. When I checked my inventory my proficiency cache is full (20/20), but there's no exotic cache. Wasted over an hour of gameplay for nothing.
If your cache inventory was full 20/20, then the cache is dropped on the ground and if not picked up soon or logging or changing instances, is lost forever. Make sure not to run around with a 20/20 cache inventory.