Discovered while testing MC-267861.

The bug

The textures used for the sides of flowing water and flowing lava are mapped backwards, resulting in them being the mirror image of their expected appearence.

How to reproduce

1. Download and apply the attached resource pack
2. Place water or lava (lava is preferred as it is not tinted)
3. Observe the arrows

Expected results

If the darker half of the arrow is on top, the arrow should be pointing to the right (when not inside of the fluid).

Actual results

This is true of the top textures of the fluids. However, this is not the case for the side textures.

How to fix

Mirror the mapping (preferably also fixing MC-267861 in the process).