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.
{
    return RPCHelpMan{"getdeploymentinfo",
        "Returns an object containing various state info regarding deployments of consensus changes.",
        {
            {"blockhash", RPCArg::Type::STR_HEX, RPCArg::Default{"hash of current chain tip"}, "The block hash at which to query deployment state"},
        },
        RPCResult{
            RPCResult::Type::OBJ, "", "", {
                {RPCResult::Type::STR, "hash", "requested block hash (or tip)"},
                {RPCResult::Type::NUM, "height", "requested block height (or tip)"},
                {RPCResult::Type::OBJ_DYN, "deployments", "", {
                    {RPCResult::Type::OBJ, "xxxx", "name of the deployment", RPCHelpForDeployment}
                }},
            }
        },
        RPCExamples{ HelpExampleCli("getdeploymentinfo", "") + HelpExampleRpc("getdeploymentinfo", "") },
        [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
        {
            const ChainstateManager& chainman = EnsureAnyChainman(request.context);
            LOCK(cs_main);
            const Chainstate& active_chainstate = chainman.ActiveChainstate();