Why were the army martyrs washed, shrouded, and prayed over, even though the majority of jurists say that martyrs are not washed, shrouded, or prayed over? And is there another opinion on the matter?

The jurists have differed regarding the ruling on one killed by rebels in battle: does he take the ruling of a martyr, so he is not washed and no prayer is offered over him, or not? There are two opinions on this:

People of Justice: The Malikis, Shafi'is, and Hanbalis held that whoever is killed from the people of justice is considered a martyr and is not washed, nor is a prayer offered over him, because he was killed in a fight commanded by Allah. They likened him to a martyr of battle against the disbelievers. A narration was reported by the Hanbalis, Al-Awza'i, and Ibn al-Mundhir that he should be washed and prayed over, basing their argument on the Prophet's (peace be upon him) saying: "Pray over whoever says 'There is no god but Allah'."

Rebels (and those in their حكم): The Malikis, Shafi'is, Hanbalis, and Hanafis held that those killed from the rebels should be washed, shrouded, and prayed over, due to the generality of the Prophet's (peace be upon him) saying: "Pray over whoever says 'There is no god but Allah'," and because they are Muslims for whom the ruling of martyrdom has not been established. The majority did not differentiate between the Khawarij and other rebels regarding the ruling on washing, shrouding, and praying.