If you enter before 23 october 2025, you will stamped in for 12 months or max the validity of your health insurance (need the special form).
Be aware that you will loose your multi-entry on october 23rd. You need to buy re-entry stamp when leaving on the new 12 months (or validity of your health insurance) stamp.
Always use the informations in the machine readable section (bottom). This especially, when special character didn't exists.
Same issue when booking airplane tickets. Some people have to rebuy a new ticket at check-in due to wrong special character ("U" instead "UE" for a "Ü")
As you have a non-OA visa, you have also the obligation to have a health insurance.
Yes, you will get a stamp of stay for 12 months (maximum) when your visa is still valid and maximum the end of your health insurance validity. Often the health insurance gives the maximum stay, as the new certificate you get normally 1 months before your new insurance is starting.