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.
if (!CheckDiskSpace(128 * 2 * 2 * pcoinsTip->GetCacheSize()))
            return state.Error("out of disk space");
        
        if (!pcoinsTip->Flush())
            return AbortNode(state, "Failed to write to coin database");
        nLastFlush = nNow;
    }
    if (fDoFullFlush || ((mode == FLUSH_STATE_ALWAYS || mode == FLUSH_STATE_PERIODIC) && nNow > nLastSetChain + (int64_t)DATABASE_WRITE_INTERVAL * 1000000)) {
        
        GetMainSignals().SetBestChain(chainActive.GetLocator());
        nLastSetChain = nNow;
    }
    } catch (const std::runtime_error& e) {
        return AbortNode(state, std::string("System error while flushing: ") + e.what());
    }
    return true;
}
void FlushStateToDisk() {
    CValidationState state;
    FlushStateToDisk(state, FLUSH_STATE_ALWAYS);
}
void PruneAndFlush() {
    CValidationState state;
    fCheckForPruning = true;
    FlushStateToDisk(state, FLUSH_STATE_NONE);
}
void static UpdateTip(CBlockIndex *pindexNew, const CChainParams& chainParams) {