test_low_latency by P2P with 8 bytes width num_token will hang

I want test low latency with 8 bytes width num_token， modify deep_ep/config.cpp
struct LowLatencyLayout {

// Symmetric signaling buffers

//size_t dispatch_recv_count_buffer_bytes = num_experts * sizeof(int);
size_t dispatch_recv_count_buffer_bytes = num_experts * sizeof(int64_t);
}

2 H20 and 2 NIC in one node , use cmd start test：
python tests/test_low_latency.py --num-processes 2 --num-topk 2 --num-experts 8

will hang in combine