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.
std::unique_ptr<CCoinsViewCursor> pcursor;
    std::optional<CCoinsStats> maybe_stats;
    const CBlockIndex* tip;
    {
        
        
        
        
        
        
        
        
        
        
        
        
        LOCK(::cs_main);
        chainstate.ForceFlushStateToDisk();
        maybe_stats = GetUTXOStats(&chainstate.CoinsDB(), chainstate.m_blockman, CoinStatsHashType::HASH_SERIALIZED, node.rpc_interruption_point);
        if (!maybe_stats) {
            throw JSONRPCError(RPC_INTERNAL_ERROR, "Unable to read UTXO set");
        }
        pcursor = chainstate.CoinsDB().Cursor();
        tip = CHECK_NONFATAL(chainstate.m_blockman.LookupBlockIndex(maybe_stats->hashBlock));
    }
    LOG_TIME_SECONDS(strprintf("writing UTXO snapshot at height %s (%s) to file %s (via %s)",
        tip->nHeight, tip->GetBlockHash().ToString(),
        fs::PathToString(path), fs::PathToString(temppath)));
    SnapshotMetadata metadata{tip->GetBlockHash(), maybe_stats->coins_count, tip->nChainTx};
    afile << metadata;