Firemonkey Semi transparent png is not visible from opposite side of TImage, Cube, Mesh and TPlane


I am using delphi 10 seatle and firemonkey(multi device application). I created a road using TPlane component and put 3 Arches(png image of Arch attached to TPlane, Mesh, cube, TImage3D) on this road. All components are attached to tDummy because i am making this project in 3D. When i attach a png image(arch) to any of the component(TImage, Cube, Mesh and TPlane), On front it looks normal but when i move my camera forward on road and turn around, the Arches are no more visible except for the one which is in front of camera. I am using no code except for the movement of camera. Any idea what am i doing wrong. Thanks

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