Can't render more than one 3D model

I'm using After Effects Beta v24.1.0 and I'm trying to add 3D models to my composition. Adding a single 3D model works fine. It renders correctly and I can tranform it however I'd like. As soon as I try to duplicate that layer to get a second 3D object (or if I drag it into the composition from the project panel) it renders as a plain rectangular block with red, blue, and green sides. No matter what I try I can't seem to get more than one 3D model to render correctly in my scene. I'm using the "Advanced 3D" renderer.

I've included an image showing the correctly rendered feather on the left. On the right is the block that appears when I duplicate the feather layer.