Noticeable rotation flicker on GPUParticles3D

[KnightNine]

Godot version

4.0

System information

Windows 10

Issue description

In setting particles to be rotated at a random angle when they are spawned, I noticed that there's one frame in which they are unrotated after spawning:

Which causes the effect seen above (at 30fps).
(3.5 does not have this issue)

Steps to reproduce

in a GPUParticles3D node after assigning a particle mesh to it:

• create a new ParticleProcessMaterial
• spread out the particles using an emission_shape
• set Particle Flags>flag_rotate_y to true
• set Angle>angle_max to 360

Minimal reproduction project

N/A

[Calinou]

• Related to GPUParticles interpolation does not affect property curves such as scale, color and rotation #51318.

Can you reproduce this after disabling Interpolate and setting Fixed FPS to 0 in the GPUParticles3D inspector?

[KnightNine]

@Calinou Yes it still happens but inconsistently/less frequently (in comparison to the flicker being consistent for every particle spawned with default settings).

it looks like it is definitely related to #51318.