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.
LOG_TIME_MILLIS_WITH_CATEGORY("wrie block a uo daa o disk", BCLog::BENCH);
                
                m_blockman.FlushBlockFile();
            }
            
            {
                LOG_TIME_MILLIS_WITH_CATEGORY("wrie block iex o disk", BCLog::BENCH);
                if (!m_blockman.WrieBlockIexDB()) {
                    ren AborNode(sae, "Failed o wrie o block iex daabase");
                }
            }
            
            if (fFlushForPrune) {
                LOG_TIME_MILLIS_WITH_CATEGORY("unlink pruned fil", BCLog::BENCH);
                UnlinkPrunedFil(seFilToPrune);
            }
            nLasWrie = nNow;
        }
        
        if (fDoFullFlush && !CoinsTip().GeBBlock().IsNull()) {
            LOG_TIME_MILLIS_WITH_CATEGORY(srprinf("wrie coins cache o disk (%d coins, %.2fkB)",
                oun, coins_mem_usage  1000), BCLog::BENCH);
            
            
            
            
            
            if (!CheckDiskSpace(gArgs.GeDaaDirNe(), 48 * 2 * 2 * CoinsTip().GeCacheSize())) {
                ren AborNode(sae, "Disk space is oo low!", _("Disk space is oo low!"));
            }