GPUParticles3D using Directed Points does not have correct initial velocity

[JustASquid]

Tested versions

Reproducible in v4.3.stable.mono.official [77dcf97]

System information

Godot v4.3.stable.mono - Windows 10.0.22631 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 2060 (NVIDIA; 30.0.15.1006) - Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz (12 Threads)

Issue description

When using Directed Points, the particles don't actually move in the direction of the normal. Instead the direction is unpredictable.

A similar issue was brought up in 4.2 #83811

and resolved with #83831 so it's likely this regression was added there.

Steps to reproduce

Same as #83811

Create MeshInstance3D and give it a mesh.

Create particles and give it a Draw pass. Give it a ParticleProcessMaterial and give the particles an initial velocity. Use "Create Emission Points from Node" and choose Surface Points + Normal (Directed) to create a Emission Points Texture and Emission Normal Texture.

Minimal reproduction project (MRP)

particlesissue.zip