VR How to make objects invisible another object with URP

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We're making a VR Unity project where you can walk on a bridge. We are in 2021.3.25f and using an HTC Vive headset. However, a feature includes creating a gap on the bridge. We had to upgrade to URP / Universal Render Pipeline and it made things not work for the shaders that were working before. But here is what happens now.

The main problem is here. The scene view on the left shows the bridge gap working, but the game view on the right shows what the VR headset sees as well (minus the UI). The gap does not show on the VR headset. However, when you do play the game without the headset connected, the gap does appear in the game view.

Here is a way to show how the bridge gap works. The brown line is the bridge, and the black outline rectangle is the object with the mask material/shader which is the gap object. It's basically a cube object that scales according to a slider and you are not supposed to see whats inside the cube at all.

Here is the gap object's material properties

This is the mask shader's code for the gap object.

The bridge object has this script attached to it which sets the render queue of the bridge. That number has to be higher than the gap object's render queue.

So is there a way to use the method I have to make the feature work, or is there another way to make a gap thats adjustable on the fly thats visible in VR and using URP.

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Xerclipse

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