I am happy to share that we have fixed this bug in our latest release – 26.0.0 which is available worldwide now.
Going forward, our goal is to fix as many top User-Voice bugs as possible and as frequently as possible. Given the nature of the fixes, some of the bugs will take a longer time to fix, but we are on it.
You can update to the latest release using Creative Cloud desktop App: https://helpx.adobe.com/in/creative-cloud/help/creative-cloud-updates.html
Thank you for all the feedback. Keep it coming!
If you are still facing the problem , Please share with us at ShareWithAI@adobe.com keeping the title of this thread as subject to the mail.
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Same issue here , and not all preferences are reset on opening, in my case just the Units under General which change constantly to points instead of mm. It is not the first time either. It's happened with past versions of ai at least 3 or 4 times. Somehow at some point with one update or the other the issue disappeared on its own.