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.
{"time", RPCArg::Type::STR, RPCArg::Optional::OMITTED, "Selected statistic"},
                        },
                        RPCArgOptions{.oneline_description="stats"}},
                },
                RPCResult{
            RPCResult::Type::OBJ, "", "",
            {
                {RPCResult::Type::NUM, "avgfee", true, "Average fee in the block"},
                {RPCResult::Type::NUM, "avgfeerate", true, "Average feerate (in satoshis per virtual byte)"},
                {RPCResult::Type::NUM, "avgtxsize", true, "Average transaction size"},
                {RPCResult::Type::STR_HEX, "blockhash", true, "The block hash (to check for potential reorgs)"},
                {RPCResult::Type::ARR_FIXED, "feerate_percentiles", true, "Feerates at the 10th, 25th, 50th, 75th, and 90th percentile weight unit (in satoshis per virtual byte)",
                {
                    {RPCResult::Type::NUM, "10th_percentile_feerate", "The 10th percentile feerate"},
                    {RPCResult::Type::NUM, "25th_percentile_feerate", "The 25th percentile feerate"},
                    {RPCResult::Type::NUM, "50th_percentile_feerate", "The 50th percentile feerate"},
                    {RPCResult::Type::NUM, "75th_percentile_feerate", "The 75th percentile feerate"},
                    {RPCResult::Type::NUM, "90th_percentile_feerate", "The 90th percentile feerate"},
                }},
                {RPCResult::Type::NUM, "height", true, "The height of the block"},
                {RPCResult::Type::NUM, "ins", true, "The number of inputs (excluding coinbase)"},
                {RPCResult::Type::NUM, "maxfee", true, "Maximum fee in the block"},
                {RPCResult::Type::NUM, "maxfeerate", true, "Maximum feerate (in satoshis per virtual byte)"},
                {RPCResult::Type::NUM, "maxtxsize", true, "Maximum transaction size"},
                {RPCResult::Type::NUM, "medianfee", true, "Truncated median fee in the block"},
                {RPCResult::Type::NUM, "mediantime", true, "The block median time past"},
                {RPCResult::Type::NUM, "mediantxsize", true, "Truncated median transaction size"},
                {RPCResult::Type::NUM, "minfee", true, "Minimum fee in the block"},
                {RPCResult::Type::NUM, "minfeerate", true, "Minimum feerate (in satoshis per virtual byte)"},
                {RPCResult::Type::NUM, "mintxsize", true, "Minimum transaction size"},