A few times later, my save file was still thrown out of the game when loading. I checked for mod conflicts as suggested by t1a2l. Looks like I found the conflicting mod. That's the Transfer Manager CE v2.4.23 mod. Can you check? 100% sure
I had to load and reload many times

initial, After a while of playing with Real time 2.0 mod. I realized that my save file will be thrown out of the game if I save it while an event is happening in a certain building in the game. (If the save file is when there is no event, it will load normally). After that, I had to turn off the Real time 2.0 mod, load the game, delete the buildings that were having events, and save. Exit and re-enter the game, re-sub Real time 2.0, and load the save file immediately. For the original Real time mod, I found that this did not happen.

Hello, I was introduced by t1a2l, connecting you to reflect on some issues related to Realtime 2.0 mod.