I was my playing my seasonal Demon Hunter and was in a Torment 16 Nephalem Rift when I came across a Gelatinous Sire. I killed the Sire and then the 2 Gelatinous Spawns that were summoned. However, no further gelatinous goblins appeared and I received zero loot.
I am currently using the Gears of Dreadlands set and am Paragon Level 917.