Error: The value of shadow key property 'ResourceDemandChunks.Id' is unknown when attempting to save

 modelBuilder.Entity<WorkingTaskEntity>().OwnsOne(c => c.CustomData, t =>  
 {
     t.ToJson();
     t.OwnsMany(customData => customData.ResourceDemandChunks);
 }); 

public WorkingTaskData? CustomData { get; init; }
public record WorkingTaskData 
{
   public List<ResourceDemandChunks> ResourceDemandChunks { get; set; }