https://s3.amazonaws.com/clickhouse-test-reports/0/10dc83b7a9c18228c4a4fc0dcfe6b18d2427462e/stress_test__debug__actions_.html

I found weird exception while investigating why ephemeral nodes were not removed for a long time:
https://pastila.nl/?00ec9776/d8858e442f8453f9b9e31a2f1da3cc8b
{
    auto future_result = asyncTryExistsNoThrow(path, watch_callback);
    if (future_result.wait_for(std::chrono::milliseconds(operation_timeout_ms)) != std::future_status::ready)
    {
        impl->finalize(fmt::format("Operation timeout on {} {}", toString(Coordination::OpNum::Exists), path));
        return Coordination::Error::ZOPERATIONTIMEOUT;
    }
    else
    {
        auto response = future_result.get();
        Coordination::Error code = response.error;
        if (code == Coordination::Error::ZOK && stat)
            *stat = response.stat;
        return code;
    }
}
bool ZooKeeper::exists(const std::string & path, Coordination::Stat * stat, const EventPtr & watch)
{
    return existsWatch(path, stat, callbackForEvent(watch));
}
bool ZooKeeper::existsWatch(const std::string & path, Coordination::Stat * stat, Coordination::WatchCallback watch_callback)