For some reason I can't parse commentary that I receive in a transaction. This commentary is specified when sending ton coins from a wallet to a smart contract.

Here is the code of the contract:

int balance() inline_ref method_id {
    return get_balance().pair_first();
}
(int) load_data() inline {
    var ds = get_data().begin_parse();       
    return (ds~load_uint(8));
}
int test() method_id {
    var (test) = load_data();
    return test;
}
() recv_internal (int msg_value, cell in_msg_full, slice in_msg) impure {
    int op = in_msg~load_uint(32);
    if (op == 0) {
        int kek = in_msg~load_uint(8);
        set_data(begin_cell().store_uint(kek, 8).end_cell());
    }
}

When I call the testgetter I always get 0. I know about the unicode encoding, I've tried to load different size from in_msg.

What can cause the problem?