You cannot select planes in career missions unless you choose to freelance. I am currently doing regular career missions, and they assign broken planes. I just tried the turboprop Pilatus, and it is also not functioning properly—I cannot raise the landing gear using either the control or the lever inside the plane.
This is extremely frustrating. I was eagerly awaiting this game, especially since it offers actual missions, which I find much more engaging than regular flying in MSFS 2020. However, this release is riddled with bugs. They should have conducted thorough beta testing with community involvement to fix these issues before launch.