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.
{"blockchain", &getbestblockhash},
        {"blockchain", &getblockcount},
        {"blockchain", &getblock},
        {"blockchain", &getblockfrompeer},
        {"blockchain", &getblockhash},
        {"blockchain", &getblockheader},
        {"blockchain", &getchaintips},
        {"blockchain", &getdifficulty},
        {"blockchain", &getdeploymentinfo},
        {"blockchain", &gettxout},
        {"blockchain", &gettxoutsetinfo},
        {"blockchain", &pruneblockchain},
        {"blockchain", &verifychain},
        {"blockchain", &preciousblock},
        {"blockchain", &scantxoutset},
        {"blockchain", &scanblocks},
        {"blockchain", &getblockfilter},
        {"hidden", &invalidateblock},
        {"hidden", &reconsiderblock},
        {"hidden", &waitfornewblock},
        {"hidden", &waitforblock},
        {"hidden", &waitforblockheight},
        {"hidden", &syncwithvalidationinterfacequeue},
        {"hidden", &dumptxoutset},
    };
    for (const auto& c : commands) {
        t.appendCommand(c.name, &c);
    }
}