What is the ruling if one combines two prayers in the time of the earlier one and the excuse for combining ceases after finishing both prayers but before the time for the second prayer begins?

Primary text

The combined prayers suffice, and the second prayer is not obligatory upon him in its designated time. This is because the performance of the prayer was valid and acquitted what was incumbent upon his liability (dhimmah). Once the liability is acquitted, it is not burdened thereafter. Furthermore, the obligation was fulfilled during the existence of the excuse, and its fulfillment is not invalidated by the removal of that excuse afterward, similar to the ruling for one who performs Tayammum and then finds water after completing the prayer.