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The guard-ref approach broke in React Strict Mode (dev): the ref persisted as `true` across the simulated remount, so the second invocation skipped the scroll — leaving scrollLeft=0 (today-90 at the left edge, not today). An empty-deps useLayoutEffect runs twice in Strict Mode but both executions fire against the same initial `toLeft` and produce the correct result. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>