Thanks for the suggestions, but none of that seems to work and unfortunately I’m on 5.4. And yeah I had already found that thread but their issue seemed to be a little more broad than mine. Especially since doing some further testing, it seems new meshes I’m pulling in from the content browser ARE being culled properly. Even though they’re the exact same SM as the others.
So i’m not sure where the problem stems from but it appears that only meshes that had been alt+drag copied had the culling issues. Although when alt+drag copying these new ones I’m pulling from the browser, they cull just fine too. So I’m not sure if it had something to do with pasting meshes into new sublevels, or the original meshes I had placed had something wrong with them. I’m just going to replace all the geometry I can for now and if I discover any further issues I’ll come back and mention it.
Thanks for the help though!