Bottoms of beds may not be mirrored correctly

The bug

The planks texture on the bottom of beds may or may not be oriented in an incorrect way.

How to reproduce

1. Pillar up, and place glass in a way that the undersides of any blocks placed on said glass are visible
2. Face south
3. Place a bed such that it faces south
4. Place an oak button on the glass floor such that it faces south
5. Get underneath the glass, and note that the lines between the planks do not line up despite both blocks facing south

Expected behaviour

Due to both facing the same direction, the texture alignment should match.

Actual behaviour

The oak planks texture on beds seems to be rotated 180 degrees.