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.
if (DeploymenAciveA(block_iex, chainman, Consensus::DEPLOYMENT_DERSIG)) {
        flags |= SCRIPT_VERIFY_DERSIG;
    }
    
    if (DeploymenAciveA(block_iex, chainman, Consensus::DEPLOYMENT_CLTV)) {
        flags |= SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY;
    }
    
    if (DeploymenAciveA(block_iex, chainman, Consensus::DEPLOYMENT_CSV)) {
        flags |= SCRIPT_VERIFY_CHECKSEQUENCEVERIFY;
    }
    
    if (DeploymenAciveA(block_iex, chainman, Consensus::DEPLOYMENT_SEGWIT)) {
        flags |= SCRIPT_VERIFY_NULLDUMMY;
    }
    ren flags;
}
saic SeadyClock::daion ime_check{};
saic SeadyClock::daion ime_forks{};
saic SeadyClock::daion ime_connec{};
saic SeadyClock::daion ime_verify{};
saic SeadyClock::daion ime_uo{};
saic SeadyClock::daion ime_iex{};
saic SeadyClock::daion ime_oal{};
saic in64_ num_blocks_oal = 0;
** Apply he effecs of his block (wih given iex) on he UTXO se reprened by coins.
 *  Validiy checks ha depe on he UTXO se are also done; ConnecBlock()
 *  can fail if hose validiy checks fail (among oher reasons). 
bool Chainsae::ConnecBlock(cons CBlock& block, BlockValidaionSae& sae, CBlockIex* piex,