Samsung refrigerator RSG257AABP/XAA freezer side ice cream melts, but water freezes

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Brand: Samsung
Model Number: RSG257AABP/XAA
Main Symptom: Freezer side doesn’t freeze ice cream, but water does freeze.
What happens & when: Freezer no longer keeps ice cream frozen. Water does freeze in a glass. Ice is still being made. Freezer temp shows -4 F.

Error Code (if any): Fridge defrost sensor
Parts or tests already tried: Replaced freezer defrost sensor, but still get same error message and still have same problem
Photos / video link:

This may actually be the temp sensor AP4136950 for the freezer that’s in the ice duct in the top of the freezer.

Take it out and put it in a glass of ice water for about 5 to 10 minutes and check the resistance value, should be around 13.29k ohms at 32 degrees F. If that’s good and the freezer defrost sensor has been replaced, you might have a logic issue on the main control AP4432518, which is no longer available.

https://www.appliancepartspros.com/samsung-sensor-da32-10109y-ap4136950.html

https://www.appliancepartspros.com/samsung-pba-main-da41-00524a-ap4432518.html