RTI Unreal can't read data

Hello,

We are currently making a plugin for unreal engine 4.27 in C++ that would be able to read DDS Data, at the moment we are developping the managers to handle multiple writers on one topic.
We encountered a problem where a publisher uses rti 4.5 while we use 6.1.0 and publishes the following topic : 

struct WeaponFireTopic // Used for shot creation.
{
 unsigned long long UniqueID; //@key
 boolean IsRemote;
 long ShotID;
 long ShooterEntityID;
 string<NAME_SIZE> WeaponDescriptorName;
 string<NAME_SIZE> AmmunitionDescriptorName;
 boolean IgnoreCreationSFX;
 boolean IgnoreCreationSound;
 float CurrentTime;
 boolean Force;
 Vector3FTopic Position;
 Vector3FTopic LinearVelocity;
 Vector3FTopic LinearAcceleration;
 QuaternionFTopic Rotation;
 Vector3FTopic Spin;
}

Our manager discovers each writer and spawns in the subscriber with the correct reader, but the subscriber never reads the sample, the code is : 

if (reader != dds::core::null)
{
  rti::sub::LoanedSamples<dds::core::xtypes::DynamicData> samples =
  reader.select().instance(instance).take();for (const auto& sample : samples)
 {
  if (sample->info().valid())
  {
   for (TFieldIterator<FProperty> PropIt(TopicClass); PropIt; ++PropIt)
   {
    GetFromSample(*PropIt, sample, &type, Instance);
   }
  }
  bool die = false;
  /* Get the instance state */
  const dds::sub::status::InstanceState& state =
  sample.info().state().instance_state();
  if (state == dds::sub::status::InstanceState::not_alive_disposed()) {
   die = true;
  }
  if (state == dds::sub::status::InstanceState::not_alive_no_writers()) {
   die = true;
  }
  if (state == dds::sub::status::InstanceState::not_alive_mask()) {
   die = true;
  }
  if (die) {
   reader = dds::core::null;
   instance = dds::core::null;
   GetOwner()->Destroy();
  }
 }
}

But when debugging the program stops at line 6 when checking if the sample is valid. The QoS is "supposed" to be matching (we're trusting our boss on that). We can read other topics with simple subscribers but when there is multiple writers and we have to use a manager it bugs out. RTI Admin Console can't read the topic as it is, but when we create our subscriber it can read the data with the topic we created.