The silver plates serve an purpose to hide some of the clunkier parts of the loader animation. Without them it'd look like ores never even reach the end and many of them are just magically teleported off of the loader and disappear well before reaching the end. The silver part hides that whole section where the disappearing happens so that all the items cleanly disappear into the silver part before some of them are uncleanly just teleport away.
Though, even as the mod creator I've run into this problem once before and was scratching my head a little before I figured out the source of the issue. So it may be worthwhile for me to just remove the silver plate entirely, which may make the animation look worse, but it'd show items stuck at the end.