Ever since the texture update, some entities have had unused sections of pixels that can't be noticed in game, but are confusing and misleading to players trying to get into custom textures by modifying the default ones.
Armor Stand
Blaze
Cow
All Llamas
Magma Cube
Mooshroom (red and brown)
Polar Bear
Sheep
Unused sections have been marked with blue in the attached pictures.
Linked issues
relates to 2
Attachments
Comments 2

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relates to MCPE-151604