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The refrigerator's interior is insulated, preventing rapid temperature changes.
However, sudden impacts to the cooled inner walls can cause cracks. These cracks are a result of temperature changes.
Try this.
Small cracks inside do not significantly affect refrigerator performance.
If the cooling and freezing functions are normal, rest assured that your refrigerator is working correctly.
If you are concerned about the cracks, please request a service technician's inspection.