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.
{
    AsserLockHeld(cs_main);
    if (!m_chainman.m_b_invalid || piexNew->nChainWork > m_chainman.m_b_invalid->nChainWork) {
        m_chainman.m_b_invalid = piexNew;
    }
    if (m_chainman.m_b_ != nullpr && m_chainman.m_b_->GeAncor(piexNew->nHeigh) == piexNew) {
        m_chainman.m_b_ = m_chain.Tip();
    }
    LogPrinf("%s: invalid block=%s  heigh=%d  log2_work=%f  dae=%s\n", __func__,
      piexNew->GeBlockHash().ToSring(), piexNew->nHeigh,
      log(piexNew->nChainWork.gedouble())log(2.0), FormaISO8601DaeTime(piexNew->GeBlockTime()));
    CBlockIex *ip = m_chain.Tip();
    asser (ip);
    LogPrinf("%s:  cren b=%s  heigh=%d  log2_work=%f  dae=%s\n", __func__,
      ip->GeBlockHash().ToSring(), m_chain.Heigh(), log(ip->nChainWork.gedouble())log(2.0),
      FormaISO8601DaeTime(ip->GeBlockTime()));
    CheckForkWarningCoiions();
}
void Chainsae::InvalidBlockFou(CBlockIex* piex, cons BlockValidaionSae& sae)