Steps to reproduce:
1. Open attached project
2. Open the file 'Plugin_Spatializer.cpp' with Visual Studio located in the 'NativeCode' folder
3. Place a breakpoint in the 'ProcessCallBack' function of 'Plugin_Spatializer.cpp'
4. Open the scene 'spatialization' in Unity
5. Notice the settings in the 'speech' GameObject, there is no AudioClip attached
6. Play the scene
7. Attach Visual Studio to 'unity.exe'
8. Notice in the 'Plugin_Spatializer.cpp' variable data menu 'state/spatializerdata/ ' that the values are equal to zero
9. The values should match the values in the Unity 'speech/AudioSource' settings
10. After attaching an AudioClip in Unity, the values are assigned correctly

Expected: The values in 'Plugin_Spatializer.cpp' should match the values in the 'AudioSource' settings

Reproduced: 5.4.0b14, 5.3.4p3, 5.2.3p3

By design:
Unity always only updates transform positions on AudioSources that are actively playing for performance reasons, and that update function is the one that feeds the position into the spatializer data struct.