In Homefront, the episode begins with the premise that Sisko and Odo are going to Earth to find changelings who have infiltrated and are actively causing destruction (having just blown up a conference, killing many important people).
In the conclusion, Paradise Lost, the script pivots to being about the dangers of giving too much power to the military in times of crisis. Sisko successfully prevents a military coup, but at the same time fails to make any progress in catching the changelings. The script leaves the seemingly very-real threat of the changelings totally unresolved.
Was this issue ever resolved on or off screen? If not, did the writers ever offer an explanation for not resolving it?