std::queue included in precompiled header is not part of namespace std - c++

Question

I have a problem with the inclusion of header "queue" via a precompiled header file in c++ (VS 2019).
My Visual Studio solution consists of two projects, one engine project (static library) and one sandbox project (links the engine project) to test the engine's functionality. The engine project uses a precompiled header file, in which i just included "queue" since i am implementing a message system. Both projects are using C++17.
Visual Studio compiles the engine project without a problem, the sandbox project then throws the following error while compiling:
Error C2039 'queue': is not a member of 'std' (path\to\engine\message_handler.h)
As soon as I include "queue" directly in message_handler.h (see code excerpt), the error vanishes and the project starts up just fine.
I have been using the precompiled header for almost a year now and never had any problems.
Can anyone help me with this?
Following are the relevant excerpts from my code.
Precompiled header:
#pragma once
//memory
#include <memory>
//timing
#include <chrono>
#include <ctime>
//container
#include <vector>
#include <queue>
#include <unordered_map>
#include <array>
//string and streams
#include <string>
#include <iostream>
#include <fstream>
#include <sstream>
//misc
#include <algorithm>
#include <cstdint>
#include <cmath>
#include <random>
message.h
struct Message
{
Message(){}
uint32_t id_;
};
message_handler.h
#pragma once
//#include <queue> //fixes the issue
#include "message.h"
using UnqPtr = std::unique_ptr<Message>;
class MessageHandler
{
public:
MessageHandler();
private:
static constexpr uint32_t maxMessages_ = 10000;
std::queue<UnqPtr<Message>, std::vector<UnqPtr<Message>>> msqQueue_;
};
message_handler.cpp
#include "trpch.h" //precompiled header
#include "message_handler.h"
MessageHandler::MessageHandler()
{
//reserve space in the underlying vector
std::vector<UnqPtr<Message>> queue;
queue.reserve(maxMessages_);
msqQueue_ = std::queue{queue};
}