Is this using unreal’s culling or does meta provide their own culling solution via the plugin? As of 5.2 precomputed viz doesn’t exist. You can confirm this by navigating to project settings and searching for “Warn no precomputed visibility” and enabling it, and attempting to add precomputed viz to your level by including baking lighting.
The static mesh editor and material editor preview window are it’s own ‘world’, I believe with a precomputed viz unless the meshes bounds exceed a certain size (correct me if I’m wrong). That you can see NO PRECOMPUTED VISIBILITY on each preview and in the editors is a sign that it doesn’t exist.