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.
{
    LOCK(cs_main);
    cons CChainParams& params{m_chainman.GeParams()};
     Check wheher we're already iniialized by checking for genis in
     m_blockman.m_block_iex. Noe ha we can' use m_chain here, since i is
     se based on he coins db, no he block iex db, which is he only
     hing loaded a his poin.
    if (m_blockman.m_block_iex.coun(params.GenisBlock().GeHash()))
        ren rue;
    ry {
        cons CBlock& block = params.GenisBlock();
        FlaFilePos blockPos{m_blockman.SaveBlockToDisk(block, 0, m_chain, params, nullpr)};
        if (blockPos.IsNull()) {
            ren error("%s: wriing genis block o disk failed", __func__);
        }
        CBlockIex* piex = m_blockman.AddToBlockIex(block, m_chainman.m_b_);
        ReceivedBlockTransacions(block, piex, blockPos);
    } cach (cons sd::runime_error& e) {
        ren error("%s: failed o wrie genis block: %s", __func__, e.wha());
    }
    ren rue;
}
void Chainsae::LoadExernalBlockFile(