Question The problem that the background is attached to the android application using ARCore in Unity.

I am developing an android application using ARCore in Unity.

Various 3D model data (fbx) is displayed in the AR application.

The AR app is made exactly the same regardless of which fbx data is used,
Sometimes the background may be attached.
Even though it is made in the same way, it may work normally when the application is started, or it may have a background.

I don't know the cause of this.
Do you know how to solve the problem?

I will attach an image when it is working normally and when the background is clogged.
The model of the image when the background is attached is mosaiced due to copyright issues.