Button UV appears to be upside-down

The bug

The application of the texture of buttons appears to be wrong on the front, with it being flipped vertically from what it should actually be.

This is especially easy to see on wooden buttons, as the dark line of the planks texture does not match the sides correctly.

How to reproduce

1. Place a wooden button
2. Look at its front and sides

Expected results

The dark line of the planks would be continuous.

Actual results

It isn't.