EfCore 乐观锁 DbUpdateConcurrencyException异常有时候不会抛出？

悬赏园豆：10 [待解决问题]

  public class OfficeContext : DbContext
    {
        public DbSet<Student> Students { get; set; }
        
        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.UseSqlServer(
                @"Data Source=192.168.31.215;User ID=hj;Password=hj123;Database=office;Integrated Security=false");
            optionsBuilder.LogTo(Console.WriteLine);
        }


        [Table("Student")]
        public class Student
        {

            [Column("PriKey")]
            [Key,DatabaseGenerated(DatabaseGeneratedOption.Identity)]
            public int Id { get; set; }

            [Timestamp]
            [Column("VerCol")]
            public virtual byte[] RowVersion { get; set; }

            [Column("Name")]
            public string Name { get; set; }
        }
    }

  class Program
    {
        static void Main(string[] args)
        {
            using var context = new OfficeContext();
            var a = context.Students.FirstOrDefault(x => x.Id == 1);
            a.Name = "123";
       
         var c =    context.SaveChanges();
 
        }
    }

我在 var c = context.SaveChanges(); 断点然后在sqlserver里面执update [Student] set Name ='345' where PriKey =1 然后继续执行应该正常引发异常Microsoft.EntityFrameworkCore.DbUpdateConcurrencyException 但是实际调试的时候不一会触发很困惑