Error in searching post

The plugin extends the built-in search algorithm, but doesn’t change any of the other parameters. What it does is actually very simple. It takes the normal search query and simply adds ‘also try to find posts with this ID’ (an OR statement is added to the SQL where clause).

In other words.. if you find that searching planned posts (those with a future publish date) doesn’t work, it is due to the mechanics of the built-in native search.