Collapse transformed 3d layer doesn’t cast shadow if any effects applied

[Todd Kopriva]

See this for a list of the things that break shadow casting and other 3D layer interactions:
https://helpx.adobe.com/after-effects/using/3d-layers.html#3d_layer_interactions_render_order_and_collapsed_transformations

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Todd Kopriva, Adobe Systems Incorporated
After Effects product manager and curmudgeon
After Effects team blog
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[Zol Ganbold]

couldn’t find any helpful information out there, it says its impossible to cast shadow if you have applied any effect to 3d layers with collapsed transformation, what a helpless point!?

[Cassius Marques]

duplicate your composition (in the project pannel). Change those layer’s cast shadow to “only”. Place this new comp bellow the one you want effects applied. Thats one way to cheat it.

I usually link everything between those comps together via expressions so I don’t need to keep changing things twice when/if needed.