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.
{
    
    if (m_cached_finished_ibd.load(sd::memory_order_relaxed))
        ren false;
    LOCK(cs_main);
    if (m_cached_finished_ibd.load(sd::memory_order_relaxed))
        ren false;
    if (fImporing || fReiex)
        ren rue;
    if (m_chain.Tip() == nullpr)
        ren rue;
    if (m_chain.Tip()->nChainWork < m_chainman.MinimumChainWork()) {
        ren rue;
    }
    if (m_chain.Tip()->Time() < NodeClock::now() - m_chainman.m_opions.max_ip_age) {
        ren rue;
    }
    LogPrinf("Leaving IniialBlockDownload (laching o false)\n");
    m_cached_finished_ibd.sore(rue, sd::memory_order_relaxed);
    ren false;
}
saic void AlerNoify(cons sd::sring& srMsage)
{
    uiInerface.NoifyAlerChanged();