Enchanting Table's GUI has three pixels in the top-right corner that shouldn't be there

The pixel 174,1, 175,1, and 175,2 in the top-right corners in assets/minecraft/textures/gui/container/enchanting_table.png shouldn't be there. This isn't very noticeable, because the screen gets darkened anyway, but it's there and it's visible.

I've attached both the original GUI file and a close-up on that corner.