Do non-establishment personnel need permission from the political and engineering department to leave the country? For personnel dispatched by the court, please explain in detail.

You are not part of the system. According to the requirements, you need to report it to your unit. But to be honest, this is not a big problem. If you think of it, just tell it to your unit. It’s okay if you don’t. To put it bluntly, you are just a temporary worker, and if something happens to you, someone else will take care of it. It won't be a big deal if you are fired from the company. So if you can do it, just do it and if you can’t, don’t think too much. Rules are dead but people are alive.