The total transaction count (for progress estimation) is counted as the known count at the last checkpoint, plus an estimated number per day.

The last checkpoint is now 996 days ago, and its estimated 60000 transactions per day leads to a total estimate of 96M transactions, while the real number is around 183M.

Fix this by updating the count, timestamp, and rate of transactions... with or without adding a new checkpoint.
return error("AcceptBlock(): ReceivedBlockTransactions failed");
    } catch (const std::runtime_error& e) {
        return AbortNode(state, std::string("System error: ") + e.what());
    }
    if (fCheckForPruning)
        FlushStateToDisk(state, FLUSH_STATE_NONE); 
    return true;
}
bool ProcessNewBlock(const CChainParams& chainparams, const std::shared_ptr<const CBlock> pblock, bool fForceProcessing, bool *fNewBlock)
{
    {
        LOCK(cs_main);
        
        CBlockIndex *pindex = NULL;
        if (fNewBlock) *fNewBlock = false;
        CValidationState state;
        bool ret = AcceptBlock(*pblock, state, chainparams, &pindex, fForceProcessing, NULL, fNewBlock);
        CheckBlockIndex(chainparams.GetConsensus());
        if (!ret) {
            GetMainSignals().BlockChecked(*pblock, state);
            return error("%s: AcceptBlock FAILED", __func__);
        }
    }
    NotifyHeaderTip();
    CValidationState state; 
    if (!ActivateBestChain(state, chainparams, pblock))
        return error("%s: ActivateBestChain failed", __func__);
    return true;
}
bool TestBlockValidity(CValidationState& state, const CChainParams& chainparams, const CBlock& block, CBlockIndex* pindexPrev, bool fCheckPOW, bool fCheckMerkleRoot)