MIST: Diagnosing Memory Failures in Video World Models

MIST separates "executing the change" from "remembering the change" in video world model evaluation, locating the bottleneck in the model's ability to set up a scene but failure to carry out the instructed change. Based on this, the proposed M3-Agent (Make the Missing Move) recursively revises the details of the input instruction, enabling a frozen model to successfully execute the instruction, with the reveal score more than tripling relative to the baseline.