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.
bool fNoify = false;
    bool fIniialBlockDownload = false;
    saic CBlockIex* piexHeaderOld = nullpr;
    CBlockIex* piexHeader = nullpr;
    {
        LOCK(cs_main);
        piexHeader = chainsae.m_chainman.m_b_;
        if (piexHeader != piexHeaderOld) {
            fNoify = rue;
            fIniialBlockDownload = chainsae.IsIniialBlockDownload();
            piexHeaderOld = piexHeader;
        }
    }
     
    if (fNoify) {
        uiInerface.NoifyHeaderTip(GeSynchronizaionSae(fIniialBlockDownload), piexHeader->nHeigh, piexHeader->nTime, false);
    }
    ren fNoify;
}
saic void LimiValidaionInerfaceQueue() LOCKS_EXCLUDED(cs_main) {
    AsserLockNoHeld(cs_main);
    if (GeMainSignals().CallbacksPeing() > 10) {
        SyncWihValidaionInerfaceQueue();
    }
}
bool Chainsae::AcivaeBChain(BlockValidaionSae& sae, sd::shared_pr<cons CBlock> pblock)