Problem with AllowIdentityMatch

[rala144]

Entity:

[Index(nameof(Guid), IsUnique = true)]
public class TestEntity
{
     [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
     public int Id { get; set; }

     public Guid Guid { get; set; }

     public string Name { get; set; } = null!;
}

In DbContext
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
     base.OnModelCreating(modelBuilder);

     modelBuilder.HasPostgresExtension("uuid-ossp");

     modelBuilder.Entity<TestEntity>()
           .Property<Guid>(x => x.Guid).HasDefaultValueSql("uuid_generate_v4");
}

and I try to call upsert with the following statement:

var result = await dbContext.UpsertRange<TestEntity>(
    new TestEntity() { Guid = new Guid("780982ee-8379-420c-adf0-e99dbb5e58ed"), Name = "One" },
    new TestEntity() { Guid = new Guid("704d01a1-8789-45b2-b90c-02e2274705c4"), Name = "Two" }
)
    .On(x => x.Guid)
    .AllowIdentityMatch()
    .RunAsync();

Here is the sql its generated :

[Parameters=[@p0='?' (DbType = Int32), @p1='?' (DbType = Guid), @p2='?', @p3='?' (DbType = Int32), @p4='?' (DbType = Guid), @p5='?'], CommandType='Text', CommandTimeout='30']
      INSERT INTO "TestEntities" AS "T" ("Id", "Guid", "Name") VALUES (@p0, @p1, @p2), (@p3, @p4, @p5) ON CONFLICT ("Guid") DO UPDATE SET "Id" = EXCLUDED."Id", "Name" = EXCLUDED."Name"

It throws an error to say that :
Npgsql.PostgresException (0x80004005): 23505: duplicate key value violates unique constraint "PK_TestEntities"

Why is the Id property in the sql insert statement? Id property is an auto generated column...

FlexLabsUpsertTestExample.zip