[4.2dev4] GPUParticles2D fully opaque in runtime

[Frederick-Lim]

Godot version

v4.2.dev4.official [549fcce]

System information

Windows 11 22H2

Issue description

There is no alpha effect on GPUParticle2D

Working fine with v4.1.1.stable.official [bd6af8e] and v4.2.dev3.official [013e8e3]

Steps to reproduce

Open the project main.tscn, drag the player node to see the particles are fading correctly. Run the game, moving the player, the particle is fully opaque.

Minimal reproduction project

Dodge the Creeps!.zip

[eviltrout]

I have a GPUParticles3D which is not fading my particles correctly either in 4.2dev4:

Look at the smoke trails in this screenshot from 4.2dev4:

You can see it working in 4.2dev3:

My opacity is handled by a Color Ramp with Gradient:

[clayjohn]

Seems to be a duplicate of #81166 which was fixed by #81198

Testing in master and I can confirm that this is fixed. We will release Dev5 soon with the fix!