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Backspace clears the cell (edit.clearContents) and opens an empty editor. Committing that editor ran cell.set "" on the already-empty cell, which recorded a second, empty undo step, so Ctrl+Z appeared to do nothing and the next Ctrl+Z undid an unrelated earlier edit. Committing empty text into an empty cell now runs no command. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>