If you had searched the forum and UKVi website before asking, you would have found very recent topics about this and the explanation.
3112/2024 is the date that all biometric documents (Passports and BRP cards) must be updated with more enhanced security features.
The CARD expires and will be replace, NOT the status.
https://www.gov.uk/biometric-residence- ... rt-problem
If your BRP expires on 31 December 2024
You do not need to tell UKVI if your BRP expires on 31 December 2024 but you have leave to stay longer.
UKVI will update their information on how to update your BRP in early 2024. You do not need to do anything and your immigration status will not be affected.