1. Make sure you have Foobar 2000 configured with at least two playlist tabs, with some music tracks in each one, and then launch the "Playlist search" dialog box (Ctrl+F).
2. Enter some text that will match a few tracks in the current playlist (preferably tracks that are somewhere near the top of the playlist).
3. Leaving the Playlist search box active, click on a second playlist tab. Note that the search entries from the first tab will remain in the "Playlist search" box.
4. Double-click on one of these search entries in the "Playlist search" box to play the track from the first playlist tab while still in the second playlist tab, and foobar will play a different track (at the same index) from the second playlist (provided there actually is a track at that index in the second playlist - otherwise Foobar 2000 will just ignore the double-click).
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My preference on a fix for this would be to update the contents of the "Playlist search" box each time a new tab is selected, rather than retain the contents from the previous playlist tab. That way it would be fairly easy to find something by just entering the text once and then clicking across tabs to find it.

