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I've got a simple scene with a Background plane, a glass, and a glossy floor. For whatever reason, the Background plane doesn't reflect off the glossy floor, as seen here:

Here is my node setups: enter image description here enter image description here

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There's nothing wrong with the plane, it is reflecting unto your glossy floor, it's the angle of the camera and the fact that the floor is a perfect mirror that is misleading you to think it is just showing through and not reflecting.

To see this, try to change the base color of your glossy shader:

enter image description here

Or, you can change the roughness value of your glossy shader to something above 0, and see that the reflected bits are rough:

enter image description here

Give it a go and let us know if this is truly the case or if something weird is actually happening.

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