The precomp doesn’t have a camera. I tried with and without a camera. When placing it into another comp, it carries over the rotation angles whether the precomp is a 3D or 2D layer in the new comp. Adding a camera in the main comp and setting the precomp to collapse transforms is better, it causes the perspective to be based off the main comps camera.
Really I just want 3D layers without perspective. Not sure if that’s possible, though I feel like it should be. Thanks.