Particles with the Render alignment set to "Facing" act incorrectly with directional lights. They take position into account when projecting the shadow from the directional light's camera, where it should take the rotational direction of the directional light instead.

Repro steps:
1. Open TestScene from the attached project
2. Rotate the directional light
3. Observe the shadow behavior

Notes:
- Not a regression, happens at least as far back as 5.6