State of MN hiring process

Good morning!

I am just starting out in the process of finding a new job. I am really interested in positions at the state. I am not trying to get ahead of myself with this question but I certainly don’t want to be scrambling at the last minute. I have worked at the same employer for over 10 years. All of my supervisors are still here at my employer minus my most recent job. This is where the issue arises. My employer doesn’t allow for supervisors to give professional references to outside employers. I go to school virtually and have minimal contact with professors. I haven’t had contact with my previous supervisors from other employers for over 10 years so not sure how reliable that route is either. I know the one supervisor will give me a solid professional reference who just left the organization but I wanted to see if anyone had any experience with this part of the hiring process so I can try to be prepared if I am able to make this happen. Also, any other helpful information would be greatly appreciated. Thank you.