Leather Horse Armor Texture Bug

Dear Mojang Representative,

Just thought I'd let you know, just in case nobody has said it before, that Leather Horse Armor is, irritatingly, using the updated texture when one uses the Programmer Art Resource Pack.  Since it is Programmer Art, shouldn't the Leather Horse Armor sill use its classic texture?  If this isn't a bug, then sorry I ever said anything.  If it is a bug, then you're welcome!!