I am trying to use layer filtering using Qt3DRender::QLayerFilter.
For this I wrote a simple test (see below). At a certain position of the red sphere, an artifact appears, which looks like display from the another camera in coordinates (0.0, 0.0, 0.0).
In my example, the red sphere can be moved with the WSAD buttons. See (-5, 0, -13) red sphere position.  See screenshot.