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**Two times since a fresh 22.0 installation I've had a power loss event (artifically produced to test system behavior), and each time I've started getting incorrect muhash values for block heights since approximately that moment**

"Approximately", as in I've not taken care to record the exact time of events because I've expecting nothing of interest from bitcoind in particular; "incorrect", as in compared to my another long-running nodes running with coinstatsindex without power outages, **and** to its own muhash for the current tip calculated without using the index, `gettxoutsetinfo muhash null false`.

**Expected behavior**

As usual when testing power outage behavior, I've expected pretty much anything **except** silently returning incorrect data. Most desirable would be checking several recent block muhashes on restart and auto-correcting the problem.
 
**To reproduce**

Unsure if it can be reproduced reliably, but 2/2 times are rather good indicator that it may not be uncommon 

**System information**

Ubuntu Linux 20.04, `~/.bitcoin` on /dev/md raid1 over two HDDs, ext4 fs with default mount options

Running bitcoind 22.0 prebuilt binaries from bitcoincore (amd64).

Here's debug.log from a typical restart (I see nothing interesting there, just in case if some configured or autodetected parameters are relevant):
```
 2022-01-14T17:10:34Z Bitcoin Core version v22.0.0 (release build)
2022-01-14T17:10:34Z Assuming ancestors of block 00000000000000000008a89e854d57e5667df88f1cdef6fde2fbca1de5b639ad have valid signatures.
2022-01-14T17:10:34Z Setting nMinimumChainWork=00000000000000000000000000000000000000001fa4663bbbe19f82de910280
2022-01-14T17:10:34Z Using the 'shani(1way,2way)' SHA256 implementation
2022-01-14T17:10:34Z Using RdSeed as additional entropy source
2022-01-14T17:10:34Z Using RdRand as an additional entropy source
2022-01-14T17:10:34Z Default data directory /home/bitnode/.bitcoin
2022-01-14T17:10:34Z Using data directory /srv/slow/dot-bitcoin
2022-01-14T17:10:34Z Config file: /etc/bitcoin/bitcoin.conf
2022-01-14T17:10:34Z Config file arg: blockfilterindex="1"
2022-01-14T17:10:34Z Config file arg: coinstatsindex="1"
2022-01-14T17:10:34Z Config file arg: dbcache="2000"
2022-01-14T17:10:34Z Config file arg: listen="1"
2022-01-14T17:10:34Z Config file arg: maxuploadtarget="450"
2022-01-14T17:10:34Z Config file arg: peerblockfilters="1"
2022-01-14T17:10:34Z Config file arg: server="1"
2022-01-14T17:10:34Z Config file arg: txindex="1"
2022-01-14T17:10:34Z Config file arg: upnp="0"
2022-01-14T17:10:34Z Config file arg: whitelist="download@127.0.0.1"
2022-01-14T17:10:34Z Config file arg: whitelist="download@192.168.1.0/24"
2022-01-14T17:10:34Z Config file arg: zmqpubrawblock="tcp://127.0.0.1:28332"
2022-01-14T17:10:34Z Config file arg: zmqpubrawtx="tcp://127.0.0.1:28333"
2022-01-14T17:10:34Z Command-line arg: conf="/etc/bitcoin/bitcoin.conf"
2022-01-14T17:10:34Z Command-line arg: daemonwait=""
2022-01-14T17:10:34Z Command-line arg: datadir="/srv/slow/dot-bitcoin/"
2022-01-14T17:10:34Z Command-line arg: pid="/run/bitcoind/bitcoind.pid"
2022-01-14T17:10:34Z Using at most 125 automatic connections (1024 file descriptors available)
2022-01-14T17:10:34Z Using 16 MiB out of 32/2 requested for signature cache, able to store 524288 elements
2022-01-14T17:10:34Z Using 16 MiB out of 32/2 requested for script execution cache, able to store 524288 elements
2022-01-14T17:10:34Z Script verification uses 15 additional threads
2022-01-14T17:10:34Z scheduler thread start
2022-01-14T17:10:34Z HTTP: creating work queue of depth 16
2022-01-14T17:10:34Z Using random cookie authentication.
2022-01-14T17:10:34Z Generated RPC authentication cookie /srv/slow/dot-bitcoin/.cookie
2022-01-14T17:10:34Z HTTP: starting 4 worker threads
2022-01-14T17:10:34Z Using wallet directory /srv/slow/dot-bitcoin/wallets
2022-01-14T17:10:34Z init message: Verifying wallet(s)…
2022-01-14T17:10:34Z init message: Loading banlist…
2022-01-14T17:10:34Z SetNetworkActive: true
2022-01-14T17:10:34Z Using /16 prefix for IP bucketing
2022-01-14T17:10:34Z Cache configuration:
2022-01-14T17:10:34Z * Using 2.0 MiB for block index database
2022-01-14T17:10:34Z * Using 249.8 MiB for transaction index database
2022-01-14T17:10:34Z * Using 218.5 MiB for basic block filter index database
2022-01-14T17:10:34Z * Using 8.0 MiB for chain state database
2022-01-14T17:10:34Z * Using 1521.7 MiB for in-memory UTXO set (plus up to 286.1 MiB of unused mempool space)
2022-01-14T17:10:34Z init message: Loading block index…
2022-01-14T17:10:34Z Switching active chainstate to Chainstate [ibd] @ height -1 (null)
2022-01-14T17:10:34Z Opening LevelDB in /srv/slow/dot-bitcoin/blocks/index
2022-01-14T17:10:34Z Opened LevelDB successfully
2022-01-14T17:10:34Z Using obfuscation key for /srv/slow/dot-bitcoin/blocks/index: 0000000000000000
2022-01-14T17:10:38Z LoadBlockIndexDB: last block file = 2883
2022-01-14T17:10:38Z LoadBlockIndexDB: last block file info: CBlockFileInfo(blocks=17, size=20113255, heights=718645...718661, time=2022-01-14...2022-01-14)
2022-01-14T17:10:38Z Checking all blk files are present...
2022-01-14T17:10:38Z Opening LevelDB in /srv/slow/dot-bitcoin/chainstate
2022-01-14T17:10:39Z Opened LevelDB successfully
2022-01-14T17:10:39Z Using obfuscation key for /srv/slow/dot-bitcoin/chainstate: d57f45de91bd35fa
2022-01-14T17:10:39Z Loaded best chain: hashBestChain=000000000000000000001cab1821f8b5ce71faccfde4d9ae11ab444c0dff979f height=718643 date=2022-01-14T14:19:04Z progress=0.999964
2022-01-14T17:10:39Z init message: Verifying blocks…
2022-01-14T17:10:39Z Verifying last 6 blocks at level 3
2022-01-14T17:10:39Z [0%]...[16%]...[33%]...[50%]...[66%]...[83%]...[99%]...[DONE].
2022-01-14T17:12:34Z No coin database inconsistencies in last 6 blocks (9259 transactions)
2022-01-14T17:12:34Z  block index          120309ms
2022-01-14T17:12:34Z Opening LevelDB in /srv/slow/dot-bitcoin/indexes/txindex
2022-01-14T17:12:35Z Opened LevelDB successfully
2022-01-14T17:12:35Z Using obfuscation key for /srv/slow/dot-bitcoin/indexes/txindex: 0000000000000000
2022-01-14T17:12:35Z txindex thread start
2022-01-14T17:12:35Z txindex is enabled at height 718643
2022-01-14T17:12:35Z txindex thread exit
2022-01-14T17:12:35Z Opening LevelDB in /srv/slow/dot-bitcoin/indexes/blockfilter/basic/db
2022-01-14T17:12:35Z Opened LevelDB successfully
2022-01-14T17:12:35Z Using obfuscation key for /srv/slow/dot-bitcoin/indexes/blockfilter/basic/db: 0000000000000000
2022-01-14T17:12:35Z basic block filter index thread start
2022-01-14T17:12:35Z basic block filter index is enabled at height 718643
2022-01-14T17:12:35Z basic block filter index thread exit
2022-01-14T17:12:35Z Opening LevelDB in /srv/slow/dot-bitcoin/indexes/coinstats/db
2022-01-14T17:12:36Z Opened LevelDB successfully
2022-01-14T17:12:36Z Using obfuscation key for /srv/slow/dot-bitcoin/indexes/coinstats/db: 0000000000000000
2022-01-14T17:12:36Z coinstatsindex thread start
2022-01-14T17:12:36Z coinstatsindex is enabled at height 718643
2022-01-14T17:12:36Z coinstatsindex thread exit
2022-01-14T17:12:36Z block tree size = 718667
2022-01-14T17:12:36Z nBestHeight = 718643
2022-01-14T17:12:36Z loadblk thread start
....
```
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<!-- Any extra information that might be useful in the debugging process. -->
<!--- This is normally the contents of a `debug.log` or `config.log` file. Raw text or a link to a pastebin type site are preferred. -->

CAmount total_unspendable_amount;
    CAmount total_prevout_spent_amount;
    CAmount total_new_outputs_ex_coinbase_amount;
    CAmount total_coinbase_amount;
    CAmount total_unspendables_genesis_block;
    CAmount total_unspendables_bip30;
    CAmount total_unspendables_scripts;
    CAmount total_unspendables_unclaimed_rewards;
    SERIALIZE_METHODS(DBVal, obj)
    {
        READWRITE(obj.muhash);
        READWRITE(obj.transaction_output_count);
        READWRITE(obj.bogo_size);
        READWRITE(obj.total_amount);
        READWRITE(obj.total_subsidy);
        READWRITE(obj.total_unspendable_amount);
        READWRITE(obj.total_prevout_spent_amount);
        READWRITE(obj.total_new_outputs_ex_coinbase_amount);
        READWRITE(obj.total_coinbase_amount);
        READWRITE(obj.total_unspendables_genesis_block);
        READWRITE(obj.total_unspendables_bip30);
        READWRITE(obj.total_unspendables_scripts);
        READWRITE(obj.total_unspendables_unclaimed_rewards);
    }
};
struct DBHeightKey {
    int height;
    explicit DBHeightKey(int height_in) : height(height_in) {}
    template <typename Stream>
    void Serialize(Stream& s) const