I believe the main issue is not about the buy back, but how many cars are still there on the road with faulty sensor. So it’s gonna be a recall? Or there is no way to detect it?

Human lives can gone anytime with this kind of sudden braking at high speed.

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Fyi, .......

Gemini AI Overview

Yes, a weak 12V battery can potentially cause door sensors to fail or malfunction. Sensors rely on a consistent and adequate voltage supply to operate correctly. If the battery is weak or failing, it may not provide the necessary voltage for the door sensor to function properly.

Here's why a weak battery can affect door sensors:
- Insufficient Voltage:
Sensors require a specific voltage to operate. A weak battery may not provide enough power, leading to unreliable or inaccurate readings from the sensor.
- Intermittent Operation:
Even if the battery isn't completely dead, it might fluctuate in voltage, causing the sensor to operate intermittently or incorrectly.
- System Malfunction:
A weak battery can also affect other vehicle systems, including the car's computer, which might influence the operation of the door sensors.
- Other Factors:
While a weak battery is a common cause, other factors like wiring issues, sensor failures, or problems with the vehicle's computer can also contribute to sensor problems.

If you're experiencing issues with your car's door sensors, it's always a good idea to have your battery checked and ensure it's providing the necessary voltage. 
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ECU and all are regulated.. the buck regulator or power supply are all designed to expect fluctuations in the 12V.
That's why when I read the AI generated answers , I already know it is rambling on something that they don't know about.

https://industrial.panasonic.com/ww/ss/technical/b13

Door sensor maybe 'not so complex ' part of the system.

However, if it is used in conjunction with, Anti-roll away car function. The feedback loop have one more un-relenting output, which is put on the Electronic Parking brake.

Further complexity in the loop, the car also detects the blind spot of the side of the door, being opened (if driver side, it will again give verbal warning) some others have intact, experience automatic braking because the car detected some object in blind spot, meaning the rear guard rail can also play a part in this particular situation.

Therefore if the sensor is giving bad data, and the car reacted to it by applying parking brake... It is an extraordinary situation where by, either, just let the car roll, which is what usually happens, our car with M6 as the car is rolling and door is not properly closed, the car does not pop the Parking brake, but add in another seat belt sensor, when it detects you remove the belt, it will pop the Parking brake.