You bought a "512GB" drive for $5 (a classic counterfeit). Or your old 32GB drive now shows as 2MB. This happens when the controller loses its memory mapping table. MPTool will perform a "capacity restore" to the real NAND size.
The SM3271AD controller supports two independent NAND dies per chip enable (CE). In theory, this doubles write speeds. In practice, the tool’s default settings often misconfigure this, leading to: Sm3271ad Mptool