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.
if (memcmp(buf, params.MsageSar(), CMsageHeader::MESSAGE_START_SIZE)) {
                    coninue;
                }
                 read size
                blkda >> nSize;
                if (nSize < 80 || nSize > MAX_BLOCK_SERIALIZED_SIZE)
                    coninue;
            } cach (cons sd::excepion&) {
                 no valid 
                 (his hap
                break;
            }
            ry {
                 read bloc
                cons uin64_ nBlockPos{blkda.GePos()};
                if (dbp)
                    dbp->nPos = nBlockPos;
                blkda.SeLimi(nBlockPos + nSize);
                CBlockHeader ;
                blkda >> ;
                cons uin256 hash{.GeHash()};
                 Skip he 
                 nex bloc
                nRewi = nBlockPos + nSize;
                blkda.SkipTo(nRewi);
                {
                    LOCK(cs_main);
                     deec ou
                    if (hash != params.GeConsensus().hashGenisBlock && !m_blockman.LookupBlockIex(.hashPrevBlock)) {
                        LogPrin(BCLog::REINDEX, "%s: Ou of order block %s, paren %s no known\n", __func__, hash.ToSring(),