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Default value of column overrides provided non-default value

See original GitHub issue

I have such entity class:

public class Schedule
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.None)]
        public long Id { get; set; }

        public ScheduleStatus Status { get; set; }

        //other stuff
    }

    public enum ScheduleStatus
    {
        Test,
        Pilot,
        Prod
    }

And DataContext is configured this way:

public class DataContext : DbContext
{
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);

            modelBuilder.Entity<Schedule>()
                .Property(schedule => schedule.Status)
                .HasConversion(new EnumToStringConverter<ScheduleStatus>())
                .HasDefaultValue(ScheduleStatus.Test);
  
           //other stuff
        }
}

Then I upsert entites this way:

var scheduleStatus = CalculateStatus(someData);
serviceDataContext.Schedules.Upsert(new Schedule
                    {
                        Id = backendSchedule.Id,                        
                        Status = scheduleStatus,
                    })
                    .On(scenario => scenario.Id)
                    .WhenMatched((scenarioInDb, scenarioNew) =>
                        new Schedule
                        {
                            Status = scheduleStatus,
                        })
                    .Run();

And eventually all entites in the DB are populated with the default value of Status, regardless of what is actually assigned in the code above. I tried to use standard Add method instead of Upsert. This works correctly: when non-default value is provided it’s used.