Weekly World Boss Cache Not Dropping

[BOD-2796]

Not receiving World Boss weekly loot cache

Twice now, I have seen a World Boss spawn on the map showing clearly I can reveive the weekly rewards, arrived there and killed it with the others. I receive the grim favors reward, and loot from the boss itself, however I do not get the weekly cache drop. I have killed four world bosses in total now, received the cache twice and not received it twice. Yes, they were different bosses. Three last week, I received two loot caches and not the third. One today, I didn’t receive.