Diablo 4's new Lord of Hatred expansion has effectively revitalized the ARPG's endgame and loot, but with any update that fundamentally shakes up core systems to such a degree, there are bound to be some unintended interactions, and one of those appears to allow for thousands of treasure goblins in a single dungeon and so much loot the game can't keep up.
Diablo content creator FP recently released a video demonstrating a trick hiding in the Lord of Hatred DLC's new War Plans feature, which lets you pick and pull from your favorite endgame activities and pair them with special nodes to customize loot and enemy spawns. The Gauntlet node, which traps the "souls" of enemies you slay in a Nightmare dungeon's shrine buff window and then respawns them when it expires, is key to this particular exploit, but there's also a lot of luck and waiting involved to get FP's setup all lined up.