Why is there only half of Pu Songling's manuscript of Strange Tales from a Lonely Studio?

According to historical records, during the Qing Dynasty, Shandong suffered from drought, and a large number of people had to leave their homes for the east in order to survive. In this rolling stream of people, Pu Songling's seventh grandson, the Pu family, left his hometown with his family and came to Shenyang. At that time, the divination industry in Shenyang was relatively prosperous, and the Pu family were familiar with divination, so they set up a divination booth in Shenyang to make a living by divination and writing documents. Even if life is hard, he won't profit from the manuscript. Before Pu Jiaren died, he passed the manuscript of Strange Tales from a Lonely Studio to his eldest son, Pu Hao Ying, according to the ancestral rules. In the 20th year of Guangxu, Pu was in charge of the Blue Flag under General Shengjing. Knowing that Pu is a descendant of Pu Songling, Iktangga borrowed the manuscript of Strange Tales from a Lonely Studio from him. In desperation, Pu first lent out half of the manuscript, and then lent out the other half after returning it. Unexpectedly, Iktangga went to Beijing to take part in the war and died in Beijing. Then Eight-Nation Alliance invaded Beijing and plundered a lot of property. Since then, half of the manuscripts borrowed by Iktangga have never been heard from again, and its whereabouts remain a mystery.