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 (!DeploymentEnabled(chainman, dep)) return;
    UniValue rv(UniValue::VOBJ);
    rv.pushKV("type", "buried");
    
    
    rv.pushKV("active", DeploymentActiveAfter(blockindex, chainman, dep));
    rv.pushKV("height", chainman.GetConsensus().DeploymentHeight(dep));
    softforks.pushKV(DeploymentName(dep), rv);
}
static void SoftForkDescPushBack(const CBlockIndex* blockindex, UniValue& softforks, const ChainstateManager& chainman, Consensus::DeploymentPos id)