Jean is correct as usual.
I am working on a piece now that involves a huge 3space setup in AE with multiple “multi-plane” scenes and to make it managable every scene is a seperate comp with its own 3space,…all put together in another main comp with its own 3space.
I typically so far have always had my pre-comp with all layers 3D,…then when I bring it in to main comp I collapse it AND make it 3D as well so I can use my main camera…. I have run into issues with effects and track mattes in the sub comps not working once in the main comp……then I un-collapse and it works??? A bit of trial and error im afraid.
Would love to know the true source of these anomolies……