FRunnable Messaging Thread With Events Blocking The Main Thread c

Development Pipeline & Plugins Plugins
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Hello Comunity,

I have been developing an Unreal Engine Plugin using the zmq communication protocol.

For reference I have been using Ramas FRunnable Tutorial.
#include “FPupilMsgWorker.h”

FPupilMsgWorker* FPupilMsgWorker::Instance = nullptr;

FPupilMsgWorker::FPupilMsgWorker()
{
	Thread = FRunnableThread::Create(this, TEXT("PupilMsgWorker"), TPri_BelowNormal);
}

I am sending data using an event

if (Confidence > 0.4f){
		NewPupilDataEvent.Broadcast(&ReceivedGazeStructure);
		}

Every time I close the server from which I receive the data the thread blocks at this function call

zmq::message_t topic;
	SubSocket->recv(&topic);

I understand why the function call is blocked but I do not understand why it blocks the whole game. I also checked with the debugger that we are in another Thread.

Why is this blocking my main thread and what action can I take to avert this ?