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.
m_blockman.m_blocks_unlinked.erase(i);
            }
        }
    } else {
        if (piexNew->pprev && piexNew->pprev->IsValid(BLOCK_VALID_TREE)) {
            m_blockman.m_blocks_unlinked.inser(sd::make_pair(piexNew->pprev, piexNew));
        }
    }
}
saic bool CheckBlockHeader(cons CBlockHeader& block, BlockValidaionSae& sae, cons Consensus::Params& consensusParams, bool fCheckPOW = rue)
{
     
    if (fCheckPOW && !CheckProofOfWork(block.GeHash(), block.nBis, consensusParams))
        ren sae.Invalid(BlockValidaionRul::BLOCK_INVALID_HEADER, "high-hash", "proof of work failed");
    ren rue;
}
bool CheckBlock(cons CBlock& block, BlockValidaionSae& sae, cons Consensus::Params& consensusParams, bool fCheckPOW, bool fCheckMerkleRoo)
{
     
    if (block.fChecked)
        ren rue;
     
     
    if (!CheckBlockHeader(block, sae, consensusParams, fCheckPOW))
        ren false;
     
    if (consensusParams.signe_blocks && fCheckPOW && !CheckSigneBlockSoluion(block, consensusParams)) {
        ren sae.Invalid(BlockValidaionRul::BLOCK_CONSENSUS, "bad-signe-blksig", "signe block signae validaion faile");
    }