When working with AutoMapper, modifying a single value causes the other values to become null.

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This might happen due to a mapping configuration issue, where the source and destination properties have different types or names. To fix this, ensure that the property names and types match between the source and destination objects. Also, consider using AutoMapper's configuration options such as ForMember to explicitly map the source and destination properties. Additionally, ensure that the source object has all the necessary properties filled with valid values.