Return of the #4340. Error occured when writing to timestamptz from DateTime?[] #6450

public class UnitTest1
{
    [Fact]
    public void TestPostgresqlNullableArrayDateTimeParametersWithNullNotFirstInArrayWorksFine()
    {
        var connString = "Host=localhost;Username=postgres;Password=postgres;Database=testing";
        
        var connection = new NpgsqlConnection(connString);
        connection.Open();
        using var transaction = connection.BeginTransaction();

        var createTableCommand = connection.CreateCommand();
        createTableCommand.CommandText = "create table test (dt timestamp with time zone NULL);";
        createTableCommand.ExecuteNonQuery();
        
        var insertCommand = connection.CreateCommand();
        insertCommand.CommandText = "insert into test select * from unnest(@dt);";
        insertCommand.Parameters.AddWithValue("dt", new DateTime?[] {DateTime.UtcNow, DateTime.UtcNow, null});
        // This is fine, first we have DateTime.UtcNow, then null in array
        insertCommand.ExecuteNonQuery();

        transaction.Rollback();
    }
    
    [Fact]
    public void TestPostgresqlNullableArrayDateTimeParametersWithNullFirstInArrayIsBroken()
    {
        var connString = "Host=localhost;Username=postgres;Password=postgres;Database=testing";
        
        var connection = new NpgsqlConnection(connString);
        connection.Open();
        using var transaction = connection.BeginTransaction();

        var createTableCommand = connection.CreateCommand();
        createTableCommand.CommandText = "create table test (dt timestamp with time zone NULL);";
        createTableCommand.ExecuteNonQuery();
        
        var insertCommand = connection.CreateCommand();
        insertCommand.CommandText = "insert into test select * from unnest(@dt);";
        insertCommand.Parameters.AddWithValue("dt", new DateTime?[] {null, DateTime.UtcNow, DateTime.UtcNow});
        // This is broken (throws exception), first we have null, then, DateTime.UtcNow in array
        insertCommand.ExecuteNonQuery();

        transaction.Rollback();
    }
}