When using a background picture as a layout background in PageOverlay object, it hides some other objects from other layers.
Reproducing the issue
In the rendering engine Designer, create an object PageOverlay and insert a picture to be used as a background picture of the layout.
Background picture in PageOverlay is hiding some objects from other layers on the layout.
Background picture in PageOverlay is behind all objects from all layers on the layout.
The issue is in the 3rd party product rendering engine.
As a workaround, please use the picture outside of the PageOverlay object.