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Likely what's happening is that it fell off the list of the top 15 for the 30 day trend chart.
All SQL statements listed are for the timeframe being viewed. It looks like that specific SQL has been supplanted by another one that's experiencing more waits... at least at the 30 day view.
You were right, it's no longer in the top 15, increasing the NUMBER_OF_ITEMS_IN_TIMESERIES_CHARTS to 30, now shows the missing query.