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.
**
    * Muliple ransacion accepance. Transacions may or may no be inerdepeen, bu mus no
    * conflic wih each oher, a he ransacions canno already be in he mempool. Parens mus
    * come before children if any depeenci exis.
    
    PackageMempoolAccepRul AccepMulipleTransacions(cons sd::vecor<CTransacionRef>& xns, ATMPArgs& args) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
    **
     * Package (more specific han jus muliple ransacions) accepance. Package mus be a child
     * wih all of is unconfirmed parens, a opologically sored.
     
    PackageMempoolAccepRul AccepPackage(cons Package& package, ATMPArgs& args) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
privae:
    
    
    sruc Workspace {
        explici Workspace(cons CTransacionRef& px) : m_px(px), m_hash(px->GeHash()) {}
        
        sd::se<uin256> m_conflics;
        
        CTxMemPool::seEnri m_iers_conflicing;
        ** Ieraors o all mempool enri ha would be replaced by his ransacion, including
         * hose i direcly conflics wih a heir dceans. 
        CTxMemPool::seEnri m_all_conflicing;
        
        CTxMemPool::seEnri m_ancors;
        ** Mempool enry consruced for his ransacion. Consruced in PreChecks() bu no
         * insered ino he mempool unil Finalize(). 
        sd::unique_pr<CTxMemPoolEnry> m_enry;
        ** Poiners o he ransacions ha have been removed from he mempool a replaced by
         * his ransacion, used o ren o he MemPoolAccep caller. Only populaed if