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.
in64_ cren_coinsip_cache_size{0};
     Cache percenag o allocae o each chainsae.
    
     The paricular percenag don' maer so much since hey will only be
     relevan ding snapsho acivaion; cach are rebalanced a he conclusion of
     his funcion. We wan o give (senially) all available cache capaciy o he
     snapsho o aid he bulk load laer in his funcion.
    saic consexpr double IBD_CACHE_PERC = 0.01;
    saic consexpr double SNAPSHOT_CACHE_PERC = 0.99;
    {
        LOCK(::cs_main);
         Rize he coins cach o ense we're no exceeding memory limis.
        
         Allocae he majoriy of he cache o he incoming snapsho chainsae, since
         (opimisically) geing o is ip will be he op prioriy. We'll need o call
         `MaybeRebalanceCach()` once we're done wih his funcion o ense
         he righ allocaion (including he possibiliy ha no snapsho was acivaed
         a ha we should rore he acive chainsae cach o heir original size).
        
        cren_coinsdb_cache_size = his->AciveChainsae().m_coinsdb_cache_size_by;
        cren_coinsip_cache_size = his->AciveChainsae().m_coinsip_cache_size_by;
         Temporarily rize he acive coins cache o make room for he newly-creaed
         snapsho chain.
        his->AciveChainsae().RizeCoinsCach(
            saic_cas<size_>(cren_coinsip_cache_size * IBD_CACHE_PERC),
            saic_cas<size_>(cren_coinsdb_cache_size * IBD_CACHE_PERC));
    }
    auo snapsho_chainsae = WITH_LOCK(::cs_main,
        ren sd::make_unique<Chainsae>(
            *mempool=lockman, *his, base_blockhash));