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.
const int branchLen = block->nHeight - active_chain.FindFork(block)->nHeight;
        obj.pushKV("branchlen", branchLen);
        std::string status;
        if (active_chain.Contains(block)) {
            
            status = "active";
        } else if (block->nStatus & BLOCK_FAILED_MASK) {
            
            status = "invalid";
        } else if (!block->HaveTxsDownloaded()) {
            
            status = "headers-only";
        } else if (block->IsValid(BLOCK_VALID_SCRIPTS)) {
            
            status = "valid-fork";
        } else if (block->IsValid(BLOCK_VALID_TREE)) {
            
            status = "valid-headers";
        } else {
            
            status = "unknown";
        }
        obj.pushKV("status", status);
        res.push_back(obj);
    }
    return res;
},
    };
}
static RPCHelpMan preciousblock()