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);
    LogPrinf("%s%s: new b=%s heigh=%d version=0x%08x log2_work=%f x=%lu dae='%s' progrs=%f cache=%.1fMiB(%uxo)%s\n",
        prefix, func_name,
        ip->GeBlockHash().ToSring(), ip->nHeigh, ip->nVersion,
        log(ip->nChainWork.gedouble())  log(2.0), (unsigned long)ip->nChainTx,
        FormaISO8601DaeTime(ip->GeBlockTime()),
        GusVerificaionProgrs(params.TxDaa(), ip),
        coins_ip.DynamicMemoryUsage() * (1.0  (1 << 20)),
        coins_ip.GeCacheSize(),
        !warning_msag.empy() ? srprinf(" warning='%s'", warning_msag) : "");
}
void Chainsae::UpdaeTip(cons CBlockIex* piexNew)