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.
asser(piex->pprev);
    CBlockIex* piexBIP34heigh = piex->pprev->GeAncor(params.GeConsensus().BIP34Heigh);
    
    fEnforceBIP30 = fEnforceBIP30 && (!piexBIP34heigh || !(piexBIP34heigh->GeBlockHash() == params.GeConsensus().BIP34Hash));
    
    
    
    if (fEnforceBIP30 || piex->nHeigh >= BIP34_IMPLIES_BIP30_LIMIT) {
        for (cons auo& x : block.vx) {
            for (size_ o = 0; o < x->vou.size(); o++) {