Updated Test code

Program.cs

using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Linq;
using ColdClear;

namespace TetrisOverlay
{
    class Program
    {
        static void Main(string[] args)
        {
            // in pre-release version max_node's value is uint64 type, however in C API, it was uint32
            var options = new CCOptions() { mode = CCMovementMode.CC_0G, use_hold = true, speculate = true, min_nodes = 0, max_nodes = 999999, threads = 1 };
            var weights = new CCWeights() { back_to_back = 52, bumpiness = -24, bumpiness_sq = -7, 
                                            height = -39, top_half = -150, top_quarter = -511, 
                                            jeopardy = -5, cavity_cells = -158, cavity_cells_sq = -7, 
                                            overhang_cells = -48, overhang_cells_sq = 1, covered_cells = -17, 
                                            covered_cells_sq = -1, tslot = new int[] { 8, 148, 192, 407 }, well_depth = 57,
                                            max_well_depth = 17, well_column = new int[] { 20, 23, 20,
                                                                                           50, 59, 21,
                                                                                           59, 10, -10,
                                                                                           24 },
                                            b2b_clear = 104, clear1 = -143, clear2 = -100, clear3 = -58, clear4 = 390,
                                            tspin1 = 121, tspin2 = 410, tspin3 = 602, mini_tspin1 = -158,
                                            mini_tspin2 = -93, perfect_clear = 999, combo_garbage = 150, move_time = -3,
                                            wasted_t = -152, use_bag = true };

            /*
            IntPtr optionPtr = Marshal.AllocHGlobal(Marshal.SizeOf(options));
            IntPtr weightPtr = Marshal.AllocHGlobal(Marshal.SizeOf(weights));
            Marshal.StructureToPtr(options, optionPtr, true);
            Marshal.StructureToPtr(weights, weightPtr, true);
            */
            // using marshaled IntPtr or passing struct with ref parameter doesn't make any difference. bot still dies immediately.
            Console.WriteLine("launching cold clear");
            var ccBot = ColdClearAPI.cc_launch_async(ref options, ref weights);
            //IntPtr cc_Pointer = ColdClearAPI.cc_launch_async(optionPtr, weightPtr);
            Console.WriteLine("launching complete");

            var isDead = ColdClearAPI.cc_is_dead_async(ccBot);
            //already died after launching, (no matter how much the time spents, immediately or delayed)
            ColdClearAPI.cc_add_next_piece_async(ccBot, CCPiece.CC_I);
            ColdClearAPI.cc_add_next_piece_async(ccBot, CCPiece.CC_J);
            ColdClearAPI.cc_add_next_piece_async(ccBot, CCPiece.CC_L);
            ColdClearAPI.cc_add_next_piece_async(ccBot, CCPiece.CC_O);
            ColdClearAPI.cc_add_next_piece_async(ccBot, CCPiece.CC_S);
            ColdClearAPI.cc_add_next_piece_async(ccBot, CCPiece.CC_T);
            ColdClearAPI.cc_add_next_piece_async(ccBot, CCPiece.CC_Z);

            ColdClearAPI.cc_request_next_move(ccBot, 0);
            CCMove move = new CCMove();
            var result = ColdClearAPI.cc_poll_next_move(ccBot, ref move);

            ColdClearAPI.cc_destroy_async(ccBot);

            Console.WriteLine("End test");
        }
    }
}