Fix: EEVEE-Next: Workaround for Nvidia shader compiler

Using the previously computed L breaks shadows on reflection probes,
even if the value should be the same.

Pull Request: https://projects.blender.org/blender/blender/pulls/119219

source/blender/draw/engines/eevee_next/shaders/eevee_shadow_tracing_lib.glsl

@@ -472,6 +472,12 @@ vec3 shadow_pcf_offset(LightData light, const bool is_directional, vec3 P, vec3
 
   /* Project the offset position into the surface */
 
+#ifdef GPU_NVIDIA
+  /* Workaround for a bug in the Nvidia shader compiler.
+   * If we don't compute L here again, it breaks shadows on reflection probes. */
+  L = light_vector_get(light, is_directional, P).L;
+#endif
+
   if (abs(dot(Ng, L)) > 0.999) {
     return ws_offset;
   }