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Auto-expansion picks the composition whose clip window contains the playhead, and those windows are half-open. With the playhead parked on the last clip's end - where playback stops - it sat inside nothing, so every expanded sub-composition row and its keyframe lanes collapsed to a single host row. Accept the closing boundary, but only when the strict pass matched nothing, so a playhead on the seam between two adjacent clips still expands the one that is starting.