I recently revisited the 1991 film Terminator 2, the one of the liquid robots, and found a problem in the original setting of the series: John Connor's father.

Terminator: Genesis
People who have watched the Terminator series know the origin of the whole story: after the awakening of the future Skynet, it was stubbornly resisted by the human resistance led by John Connor, in order to defeat humans, Skynet sent a robot killer, traveled through time and space to the past, assassinated John Connor, the leader of the human resistance army who was still in his infancy, and tried to kill him, there would be no such leader in the future, and there would be no resistance against Skynet.
This unexplained problem originally set up appears in the first Terminator, and when the first robot killer is sent back in time to assassinate John Connor's mother, Sarah Connor, the Human Resistance also sends a protector, Carreth, to protect Sarah Connor. The plot makes Carreus fall in love with Sarah Connor in the process of protecting Sarah Connor, and there is the crystallization of the two John Connor, who is the leader of the future human resistance.
Several later films have come according to this setting, including Terminator 2: Judgment Day, Terminator 2018, Terminator: Genesis, and the latest Terminator: Dark Fate, which follows the original setting: Carreth came to the past and gave birth to John Connor.
UNexplainable BUG: Before the initial crossing, from the beginning of the Big Bang to the Awakening of Skynet, but not yet sent a killer to kill the young John Connor in the past, how was John Connor, the leader of the human resistance, born? Because if Skynet hadn't sent the robot killer back to the past, and the Human Resistance hadn't sent Karris back to protect John Connor's mother, there would have been no John Connor in the future! So where did John Connor, the leader of the human resistance at this time, come about?
The best explanation is that when he had not traveled through time and space at the beginning, John Connor's father was not Calris, but someone else, and when he became the leader and sent Calris back to the past, John Connor's father became Karris, and the infinite cycle that followed, John Connor's father must be Carrees.
Then, according to this logic, the first part of The Terminator begins, when John Connor, who became the leader, sent Karris to protect his mother, and the moment Carreth and Sarah Connor had a love crystallization, John Connor, the leader of the human resistance, did not exist, because before his father met her mother Sarah Connor, her mother fell in love with Carles, the protector he had sent by himself, and then had another John Connor.
So, in the first part of Terminator, when the protector sent by humanity, Carris, falls in love with Sarah Connor, the leader of the human resistance, John Connor, is terminated by the people he sent to protect his mother!
Skynet has already won.
PS: The Book of Searching for Qin has the same mistake: initially, from the birth of Xiang Shaolong to the time he crossed over to the Qin Dynasty, Xiang Yu already existed, and the history of book burning and pit Confucianism had already occurred. The best explanation is that before Xiang Shaolong crossed back, Xiang Yu's father had someone else, and there were other reasons for the book burning pit, and he only began the infinite cycle of history after he crossed back.