In October 1422, a rumor spread through that the Dauphin, leader of France against the Anglo-Burgundians, had died when a floor collapsed under him.
This rumor turned out to be false; the collapse did happen, but the Dauphin was not among those killed. But suppose he was.
In theory, this leaves the child king Henry VI with no one to oppose him! The next claimant, Charles, Duke of Orleans, is already a prisoner in an English castle! God has shown his favor!
Except...
The Burgundians and the Armagnacs had allied plenty of times during the course of the Hundred Years War. And Burgundian rapprochement with France proved fatal to the English cause after the Treaty of Arras in 1435...
Given that the English still go through a regency for Henry VI, an insane king, perhaps we just see a French state that begins the early modern period with control of the Low Countries?