As long as the ancient books reissued now are all from regular publishing houses, most of them have not been deleted except for mistakes. However, the differences between different versions of the same ancient book are generally based on the age and version of the original ancient book, which is slightly different. This is called academic dispute, not hands and feet.
History itself is one-sided. When you look at a history book, you look at history from the author's point of view. Therefore, it is necessary to study history, read the history of different compilers in the same era, and then sum up the laws and draw your own views. The ruler of a dynasty must want a glorious history book, and he will inevitably cover up those ugly things. Political power is also composed of individuals and human nature, so history cannot be completely objective and pure. Not to mention ancient books, such as Historical Records written by Sima Qian, why did Lu Xun praise Li Sao without rhyme after reading it? It is because Sima Qian was mixed with personal feelings, so it can be said that all historical books are "tampered", true and fictional.