the command "bitcoin-cli getblockstats 0000000000000000000c61ff8f761ce509fc8901d3c22d61fec89637042ea2ba" does not work.

It displays "error: Error parsing JSON:0000000000000000000c61ff8f761ce509fc8901d3c22d61fec89637042ea2ba"

but it should display the block stats like the documentation says.

also bitcoin-cli getblockstats 0 does not work. block number must be at least 1 to work. But blocks start at 0.

tested with 0.20.1 on freebsd, another user on IRC acknowledged the problem.
CAmount total_unspendable_amount;
    CAmount total_prevout_spent_amount;
    CAmount total_new_outputs_ex_coinbase_amount;
    CAmount total_coinbase_amount;
    CAmount total_unspendables_genesis_block;
    CAmount total_unspendables_bip30;
    CAmount total_unspendables_scripts;
    CAmount total_unspendables_unclaimed_rewards;
    SERIALIZE_METHODS(DBVal, obj)
    {
        READWRITE(obj.muhash);
        READWRITE(obj.transaction_output_count);
        READWRITE(obj.bogo_size);
        READWRITE(obj.total_amount);
        READWRITE(obj.total_subsidy);
        READWRITE(obj.total_unspendable_amount);
        READWRITE(obj.total_prevout_spent_amount);
        READWRITE(obj.total_new_outputs_ex_coinbase_amount);
        READWRITE(obj.total_coinbase_amount);
        READWRITE(obj.total_unspendables_genesis_block);
        READWRITE(obj.total_unspendables_bip30);
        READWRITE(obj.total_unspendables_scripts);
        READWRITE(obj.total_unspendables_unclaimed_rewards);
    }
};
struct DBHeightKey {
    int height;
    explicit DBHeightKey(int height_in) : height(height_in) {}
    template <typename Stream>
    void Serialize(Stream& s) const