Is it sufficient to pray Witr with three rak'ahs and one tasleem if the Fajr athan has been called and most of the prayer occurred after its time began?

The time for Witr ends with the break of dawn, but it is to be made up before the Fajr prayer, based on the Prophet, peace and blessings be upon him, who said: "If one of you fears the dawn, he should pray one unit of prayer (rak'ah), and it will make Witr for him what he has already prayed," and his saying: "Make the last of your prayers at night Witr." So, if Witr is delayed until dawn breaks, its time has passed, and it is prayed as a make-up. The correct view is that Witr is made up before the Fajr prayer.