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 NullUniValue;
}
UniValue reconsiderblock(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 1)
        throw runtime_error(
            "reconsiderblock \"hash\"\n"
            "\nRemoves invalidity status of a block and its descendants, reconsider them for activation.\n"
            "This can be used to undo the effects of invalidateblock.\n"
            "\nArguments:\n"
            "1. hash   (string, required) the hash of the block to reconsider\n"
            "\nResult:\n"
            "\nExamples:\n"
            + HelpExampleCli("reconsiderblock", "\"blockhash\"")
            + HelpExampleRpc("reconsiderblock", "\"blockhash\"")
        );
    std::string strHash = request.params[0].get_str();
    uint256 hash(uint256S(strHash));
    {
        LOCK(cs_main);
        if (mapBlockIndex.count(hash) == 0)
            throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");
        CBlockIndex* pblockindex = mapBlockIndex[hash];
        ResetBlockFailureFlags(pblockindex);
    }
    CValidationState state;
    ActivateBestChain(state, Params());
    if (!state.IsValid()) {
        throw JSONRPCError(RPC_DATABASE_ERROR, state.GetRejectReason());
    }