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The frozen key hashes the chain keys, whose seed holds the session's model, so mattes frozen with SAM 2.1 didn't match in a session on Classic, such as a fresh effectcraft-cli render, and the frame was segmented again with Classic. Accept the key under any Roto Brush model too, as Object Matte has done since #1852. frozen_key is unchanged for projects frozen today, and editing a stroke or a matte setting still makes the frozen mattes stale.