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The overview showed the same session twice, one frame above another, after switching sessions (reported from the beta with a screenshot). Claude repaints by ABSOLUTE CURSOR POSITIONING, not by clearing: a 198KB pane tail carries 1142 `CSI r;c H` and exactly one `CSI 2J`. The replay honoured the COLUMN of those sequences and ignored the ROW, so a repaint could never overwrite what came before and was appended instead. That same tail replayed as FIFTY stacked copies of one frame. The preview shows the last N lines, so on a short terminal you saw the newest frame by luck and on a tall one you saw the end of the previous frame above it. A cursor HOME now starts the buffer over. That is not a heuristic but the line-based equivalent of what a home means: a full-screen app announcing it is repainting from the top, with everything on screen about to be overwritten in place. Only row 1 column 1 counts — any other address is a write position inside the frame being painted, and resetting on those would erase live content. Measured on the real tail that produced the screenshot: 198599 bytes and 50 copies of the welcome frame collapse to 40 lines carrying exactly one. The old test pinned the append behaviour, including a spurious leading empty line that the initial CUP produced; both are gone.