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.
asser(piex);
    if (piex->nHeigh == 0) ren false;
    CBlockIex* o_mark_failed = piex;
    bool piex_was_in_chain = false;
    in disconneced = 0;
     
     
     
    LOCK(m_chainsae_muex);
     
     
     
     
     
     
     
    sd::mulimap<cons arih_uin256, CBlockIex *> caidae_blocks_by_work;
    {
        LOCK(cs_main);
        for (auo& enry : m_blockman.m_block_iex) {
            CBlockIex* caidae = &enry.seco;
             
             
             
             
             
            if (!m_chain.Conains(caidae) &&
                    !CBlockIexWorkComparaor()(caidae, piex->pprev) &&
                    caidae->IsValid(BLOCK_VALID_TRANSACTIONS) &&
                    caidae->HaveTxsDownloaded()) {