Texture error with Classic Pack resource in Loom

This isn't probably noticeable unless you actually notice or test this, but there's a strange texture issue with the select in the Loom's interface. If you look closely at what's on it, it looks like every version of the banner outcome, but small and with every kind on each slot. I've checked the resource packs I have active, and it shows fine with all the ones I keep active except the Classic Resource Pack (The one released in the Marketplace by Mojang). I'm not sure how long this has been a thing, but there's a chance it's a form of texture bug since the resource pack is just specifically for the original resources and hasn't been updated since it's release several years ago.