Composure synthesis, the final result is covered by the foreground CG layer

While using the built-in composure composition in the engine, I set up the foreground CG layer and the background CG layer. According to the documentation, I made a specification that includes the foreground object for the foreground CG layer. However, the result was that the foreground object completely covered the background and media in the composition. I couldn’t get the correct composition result. Has anyone encountered


this problem?