Sandboxing stopped: Flathub apps have access to all folders and files outside their sandbox. What could cause this challenge?

I think it would always be good to provide a dialog box explaining the operation in which permission is granted through this method, at least sometimes, so that users are aware of what they are doing. I have a question I haven’t looked into regarding this method: does the connection to the file or directory close when the application closes? I think I’ve had to kill some processes for that reason, although I’m not sure.