I will admit, this does throw a spanner in the works of Henry V. But the question is "by how much". Obviously he
can't claim the crown of France - Guienne was never rumoured to be illegitimate like OTL Charles VII - but Agincourt happened and apparently surprised even the English. The English just sorta kept rolling from that momentum. So, IMO, it could lead to an interesting momentum. Especially since OTL Troyes was (IIRC) a case of Henry V holding a sword over Isabeau's head "sign this or I go out and keep breaking things until you do". With an infant dauphin (how would that title work, anyway, since Charles VI's sons were the first holders, and AIUI it was never specified if the title was reserved for the eldest son of the king (à la Prince of Wales) or not), things would change. Henry V can't demand the crown, but he
can demand territorial concessions from Paris (Aquitaine, ICR offhand where else England was claiming).
The duke of Burgundy
might exploit the situation as well. Henry keeping France on the backfoot is good for Burgundy, Jean sans Peur might not want to dismember his grandson's kingdom (least, not entirely), but he
will want to achieve a sort of "independence" for Burgundy I'd imagine.
@Zulfurium