@tleijiserge i am not sure if this is related, but there was an issue in 4.5 with instanced mesh prims not showing up via making duplicates via GUI. below is the response:
the workaround i highlighted in earlier posts in that thread was to turn off instanceable from prims. i haven’t tested this in 5.0 GA release, so it could be worth looking into the changelog and see if it’s something the dev team has already addressed.
i know the use case may be different as your are spawning the prims programmatically (feel free to correct me if that statement isn’t true) but do you know if you are using assets that are defined as instanceable in your case?
and out of curiosity, you also mentioned you are able to by pass this by refreshing the viewport, how are you doing that?