Planar Reflections not reflecting geometry?

Development Rendering
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1

How do we properly activate planar reflections?
I added a PlanarReflection to the scene, but it seems to only reflect the sky when preview plane is on.
Is that correct? We never see the geometry reflected.
The project settings has clip for planar reflection on (and UE restarted).

We also saw a flag for planar reflection in the materials. We turned it on, and then forward shading in project settings (says its experimental), then UE crashed (4.13) and we were unable to get back into the project. Is there a way to repair an existing project?

2

for reliability… it might be advisable to upgrade your editor to 4.18…

where did you put your planar reflection? it might not be at the correct location to pick up the meshes on your level.