Radiant Golden Rabbit's Residence dropping less loot

I just did 3 of these and have received Oreha Thick Meat (t3 rare hunting loot) from all the rabbits in the instance apart from the golden rabbit, which only gave uncommon hunting loot. All 3 golden rabbits did not drop Oreha Thick Meat. The maybe 10 previous instances I’d done a few weeks back had all dropped Oreha Thick Meat from all mobs if I remember correctly, so I just wanted to check if there was a bug here or if the Oreha Thick Meat was not a guaranteed drop like I’d assumed, thanks.