Error System.IO.EndOfStreamException when reading text by function NpgsqlDataReader.GetChars in version 8.0.0 #5616

const string connectionString = "Host=localhost;Port=5432;Database=[DB];Username=[USERNAME];Password=[PASSWORD];";
const string tableName = "TEST";
char[] buffer = new char[2];
using (var connection = new Npgsql.NpgsqlConnection(connectionString)) {
    connection.Open();
    using(var command = connection.CreateCommand()) {
        command.CommandText = $"DROP TABLE IF EXISTS {tableName}";
        command.ExecuteNonQuery();
        command.CommandText = $"CREATE TABLE {tableName}(DATA text)";
        command.ExecuteNonQuery();
        command.CommandText = $"INSERT INTO {tableName} (DATA) VALUES ('01234567')";
        command.ExecuteNonQuery();
        command.CommandText = $"SELECT DATA FROM {tableName}";
        using(var reader = command.ExecuteReader(System.Data.CommandBehavior.SequentialAccess)) {
            reader.Read();
            long count = -1;
            //count = reader.GetChars(0, 0, buffer, 0, 2); //the error does not occur if reading starts from position 0
            count = reader.GetChars(0, 2, buffer, 0, 2);
            count = reader.GetChars(0, 4, buffer, 0, 2);
            count = reader.GetChars(0, 6, buffer, 0, 2); //System.IO.EndOfStreamException: 'Attempted to read past the end of the stream.'

        }
    }
}