Banner patterns in loom show weird shapes when using texture packs

Summary:
When using certain texture packs, the banner patterns in the loom do not display properly.

Affected packs (list may be incomplete):

• Minecraft Classic Texture Pack
• Star Wars Texture Pack
• Norse Mythology Texture Pack

Steps to Reproduce:

1. Download and enable any of the texture packs from the list above
2. Place and open a loom

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Original Description:
I was going to make a banner pattern for my Castle Fortress but when I put the banner on the loom it shows no patterns.